X-Git-Url: https://git.ladys.computer/Shushe/blobdiff_plain/b35bba8fd8d4fd778d7fe1028590c4c847c9f877..2b85a319534edf60358ac73d57ad0d34b7a6d113:/GNUmakefile

diff --git a/GNUmakefile b/GNUmakefile
index ba4df95..95fcbf4 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -6,15 +6,14 @@ SHELL = /bin/sh
 # ━ § BASIC INFORMATION ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 override define makefileinfo
  ╭────────────────────────────╮
-╔╡ ⁌ ⛩️📰 书社 ∷ GNUmakefile ╞═════════════════════════════════╗
+╔╡ ⁌ ⛩📰 书社 ∷ GNUmakefile ╞═════════════════════════════════╗
 ║╰────────────────────────────╯                                ║
 ╟┬ ¶ Prerequisites ───────────────────────────────────────────┬╢
 ║│                                                            │║
-║│ Requires G·N·U Make, at least version 3.81, a version of   │║
-║│ uuencode with base64 support, and the various programs     │║
-║│ offered by libxml2 and libxslt. Beyond this, only programs │║
-║│ required by Posix are required, altho there is a chance of │║
-║│ version incompatibilities. The full list of program        │║
+║│ Requires G·N·U Make, at least version 3.81, the Fine Free  │║
+║│ File Command, and the various programs packaged with       │║
+║│ libxml2 and libxslt. Beyond this, only programs specified  │║
+║│ by Posix are required. The full list of program            │║
 ║│ requirements is as follows :—                             │║
 ║│                                                            │║
 ║│ • awk                                                      │║
@@ -23,16 +22,17 @@ override define makefileinfo
 ║│ • cksum                                                    │║
 ║│ • cp                                                       │║
 ║│ • date                                                     │║
-║│ • diff                                                     │║
-║│ • file                                                     │║
+║│ • diff (with -u)                                           │║
+║│ • file (specifically the Fine Free File Command)           │║
 ║│ • find                                                     │║
 ║│ • grep                                                     │║
 ║│ • git (optional)                                           │║
 ║│ • ln                                                       │║
+║│ • make (specifically G·N·U Make, version 3.81 or later)    │║
 ║│ • mkdir                                                    │║
 ║│ • mv                                                       │║
 ║│ • od                                                       │║
-║│ • pax (only when generating archives)                      │║
+║│ • pax (ustar format, when generating archives)             │║
 ║│ • printf                                                   │║
 ║│ • rm                                                       │║
 ║│ • sed                                                      │║
@@ -83,7 +83,7 @@ override define makefileinfo
 ║╰────────────────────────────────────────────────────────────╯║
 ╟┬ ¶ Copyright & License ─────────────────────────────────────┬╢
 ║│                                                            │║
-║│ Copyright © 2023–2024 Lady [@ Lady’s Computer].            │║
+║│ Copyright © 2023–2024 Lady [@ Ladys Computer].             │║
 ║│                                                            │║
 ║│ This Source Code Form is subject to the terms of the       │║
 ║│ Mozilla Public License, v 2.0. If a copy of the M·P·L was  │║
@@ -149,11 +149,21 @@ SRCDIR := sources
 # Multiple directories can be given so long as files with the same name do not exist in each.
 #
 # These can be inside of `SRCDIR´ directories if desired.
-INCLUDEDIR := sources/includes
+#
+# This variable is also used by the two‐stage `MODE´, where it gives the include directory for the second stage.
+INCLUDEDIR := $(foreach dir,$(SRCDIR),$(dir)/includes)
+
+# The directory which contains the data files.
+#
+# Only used in the two‐stage `MODE´, and defaults to that `MODE´ if this directory exists.
+# This directory is used as the include directory in the first stage.
+#
+# Multiple directories can be given so long as files with the same name do not exist in each.
+DATADIR :=
 
 # The directory in which to generate temporary buildfiles.
 #
-# This variable is also used by the archiving `MODE´.
+# This variable is also used by the archiving and two‐stage `MODE´s.
 BUILDDIR := build
 
 # The directory into which to output files on `make install´.
@@ -161,20 +171,31 @@ BUILDDIR := build
 # This variable is also used by the archiving `MODE´.
 DESTDIR := public
 
-# The location of this Makefile (and related ⛩️📰 书社 files), relative to the current working directory.
+# The location of this Makefile (and related ⛩📰 书社 files), relative to the current working directory.
 #
 # By default, this is inferred from the variable `MAKEFILE_LIST´.
 #
-# This variable is also used by the archiving `MODE´.
+# This variable is also used by the archiving and two‐stage `MODE´s.
 THISDIR := $(patsubst %/,%,$(dir $(lastword $(MAKEFILE_LIST))))
 
 # Configuration of `find´.
 #
 # By default, `find´ will ignore files which begin with a period and those which are likely to cause problems for `make´.
+#
+# These variables are also used by the two‐stage `MODE´.
 EXTRAFINDRULES :=
 EXTRAFINDINCLUDERULES :=
-FINDRULES := ! '(' '(' -name '[.-]*' -o -name '*[][*?:|$$%\#\\; ]*' -o -name '*[)]' ')' -a -prune ')'$(if $(EXTRAFINDRULES), -a $(EXTRAFINDRULES),)
-FINDINCLUDERULES := $(FINDRULES)$(if $(EXTRAFINDINCLUDERULES), -a $(EXTRAFINDINCLUDERULES),)
+FINDRULES := '!' '(' '(' -name '[.-]*' -a '!' -name '.' -o -name '*[][*?:|$$%\#\\; ]*' -o -name '*[)]' ')' -a -prune ')'$(if $(EXTRAFINDRULES), -a '(' $(EXTRAFINDRULES) ')',)
+FINDINCLUDERULES := $(FINDRULES)$(if $(EXTRAFINDINCLUDERULES), -a '(' $(EXTRAFINDINCLUDERULES) ')',)
+
+# File extensions which indicate files in `SRCDIR´ which should be built as part of the first, rather than second, stage of the two‐stage `MODE´.
+DATAEXT := rdf
+
+# Rules for identifying files in `SRCDIR´ which should be built as part of the first, rather than second, stage of the two‐stage `MODE´.
+#
+# By default, this just constructs rules from `DATAEXT´.
+EXTRAFINDDATARULES :=
+FINDDATARULES := -name '.' $(foreach ext,$(DATAEXT), -o -name '$(subst ','"'"',[!.]*.$(ext))')$(if $(EXTRAFINDDATARULES), -a '(' $(EXTRAFINDDATARULES) ')',)
 
 # The list of magic files to use when determining media types.
 #
@@ -184,12 +205,24 @@ FINDINCLUDERULES := $(FINDRULES)$(if $(EXTRAFINDINCLUDERULES), -a $(EXTRAFINDINC
 EXTRAMAGIC :=
 MAGIC := $(sort $(patsubst ./%,%,$(wildcard $(THISDIR)/magic/*)) $(EXTRAMAGIC))
 
+# The list of depedencies for parsers.
+#
+# When these files change, the assumption is that the result of the parsers will change as well, even if the parsers themselves have not.
+EXTRAPARSERLIBS :=
+PARSERLIBS := $(sort $(THISDIR)/lib/split.xslt $(EXTRAPARSERLIBS))
+
 # The list of parsers for plaintext file types.
 #
 # Which parsers are provided will influence which kinds of files are recognized as plaintext.
 EXTRAPARSERS :=
 PARSERS := $(sort $(patsubst ./%,%,$(wildcard $(THISDIR)/parsers/*.xslt)) $(EXTRAPARSERS))
 
+# The list of depedencies for transforms.
+#
+# When these files change, the assumption is that the result of the transforms will change as well, even if the transforms themselves have not.
+EXTRATRANSFORMLIBS :=
+TRANSFORMLIBS := $(sort $(THISDIR)/lib/serialize.xslt $(EXTRATRANSFORMLIBS))
+
 # The list of transforms.
 EXTRATRANSFORMS :=
 TRANSFORMS := $(sort $(patsubst ./%,%,$(wildcard $(THISDIR)/transforms/*.xslt)) $(EXTRATRANSFORMS))
@@ -200,15 +233,18 @@ TRANSFORMS := $(sort $(patsubst ./%,%,$(wildcard $(THISDIR)/transforms/*.xslt))
 # ends accordingly.
 XMLTYPES := application/xml text/xml +xml
 
+# A program to run on basic X·M·L files after they are transformed.
+FINALIZE := $(XMLLINT) --nonet --nsclean
+
 ifdef GIT
 ifneq ($(wildcard $(THISDIR)/.git),)
-# A description of the current git revision of ⛩️📰 书社.
-THISREV := $(shell $(CD) $(THISDIR); $(GIT) describe 2> /dev/null || $(GIT) rev-parse HEAD 2> /dev/null || :)
+# A description of the current git revision of ⛩📰 书社.
+THISREV := $(shell $(CD) $(THISDIR); $(GIT) describe 2>>/dev/null || $(GIT) rev-parse HEAD 2>>/dev/null || :)
 endif
 
 ifneq ($(wildcard .git),)
 # A description of the current git revision of the working directory.
-SRCREV := $(shell $(GIT) describe 2> /dev/null || $(GIT) rev-parse HEAD 2> /dev/null || :)
+SRCREV := $(shell $(GIT) describe 2>>/dev/null || $(GIT) rev-parse HEAD 2>>/dev/null || :)
 endif
 endif
 
@@ -218,11 +254,14 @@ endif
 # The following modes are available :—
 #
 # • ‹ urn:fdc:ladys.computer:20231231:Shu1She4:mode:default ›:
-#   The default mode; typical Shushe behaviours.
+#   The default mode; typical ⛩📰 书社 behaviours.
 #
 # • ‹ urn:fdc:ladys.computer:20231231:Shu1She4:mode:archive ›:
 #   Generates archive files from parse results.
-MODE := urn:fdc:ladys.computer:20231231:Shu1She4:mode:default
+#
+# • ‹ urn:fdc:ladys.computer:20231231:Shu1She4:mode:_2stage ›:
+#   Two‐stage build; runs ⛩📰 书社 twice.
+MODE := urn:fdc:ladys.computer:20231231:Shu1She4:mode:$(if $(DATADIR),$(shell if $(TEST) -d $(call quote,$(DATADIR)); then $(PRINTF) '%s\n' '_2stage'; else $(PRINTF) '%s\n' 'default'; fi),default)
 
 # Set to a non·empty value to silence informative messages.
 QUIET :=
@@ -230,6 +269,14 @@ QUIET :=
 # Set to a non·empty value to print all commands as they run.
 VERBOSE :=
 
+# Posix locale information.
+LC_ALL := C
+export LC_ALL
+
+# Posix timezone information.
+TZ := UTC0
+export UTC0
+
 # The default target for this makefile.
 .DEFAULT_GOAL := all
 
@@ -258,19 +305,12 @@ override space := $(empty) $(empty)
 # A variable which contains a single comma.
 override comma := ,
 
+# (callable) Make empty strings non·empty, and non·empty strings empty.
+override not = $(if $1,,1)
+
 # (callable) Quote the given string for use within shell calls.
 override quote = '$(subst ','"'"',$1)'
 
-# (callable) Get the modified time of the provided file.
-#
-# This touches a file containing only a newline and then diffs it with `/dev/null´ and extracts the timestamp from the diff.
-# Interestingly, on Macintosh, the format of `diff -u´ is only Posixy (including a fractional component and timezone) when `COMMAND_MODE=legacy´; however, the timezone will always be zero and the fractional component is ignorable, so it’s not necessary to worry about that here.
-#
-# The diff will always have an exit status of 1, but this is ignored by piping into Sed.
-#
-# ☡ This variable creates a subshell every time it is computed.
-override modtime = $(shell if $(TEST) ! -f $(call quote,$(BUILDDIR)/.mtime); then $(PRINTF) '%b' '\n' > $(call quote,$(BUILDDIR)/.mtime); fi; $(TOUCH) -r $(call quote,$1) $(call quote,$(BUILDDIR)/.mtime); TZ=UTC0 $(DIFF) -u $(call quote,$(BUILDDIR)/.mtime) /dev/null | $(SED) '1!d;s/.*	\([^ ]*\) \([^ ]*\).*$$/\1T\2Z/')
-
 # ─ ¶ Recipe Variable Definitions ─────────────────────────────────────
 
 # Outputs an `@´ to silence rules, unless `VERBOSE´ is non·empty.
@@ -291,13 +331,13 @@ override xargsquote = $(SED) $(call quote,s/'/'"'"'/g;s/^/'/;s/$$/'/;$$!s/$$/\\/
 override xargsmultiquote = $(SED) $(call quote,s/'/'"'"'/g;s/^/'/;s/$$/'/)
 
 # (callable) Test if the provided xpath expression matches the provided document.
-override xpath = $(XMLLINT) --xpath $(call quote,$1) $(call quote,$2) > /dev/null 2> /dev/null
+override xpath = $(XMLLINT) --noent --nonet --xpath $(call quote,$1) $(call quote,$2) >>/dev/null 2>>/dev/null
 
 # (callable) Extract the value of the text nodes in the provided X·M·L document and print them to `stdout´.
-override extracttext = $(PRINTF) '%s' '<transform xmlns="http://www.w3.org/1999/XSL/Transform" version="1.0"><output method="text" encoding="UTF-8"/></transform>' | $(XSLTPROC) --nonet --novalid - $(call quote,$1)
+override extracttext = $(PRINTF) '%s' '<transform xmlns="http://www.w3.org/1999/XSL/Transform" version="1.0"><output method="text" encoding="UTF-8"/></transform>' | $(XSLTPROC) --nonet --novalid --nomkdir --nowrite - $(call quote,$1)
 
 # (callable) Process the provided transformation result and output the result to the provided location, given the provided relative path.
-override processresultto = if $(call xpath,/*[local-name()="raw-text" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"],$1); then $(call extracttext,$1) > $(call quote,$2); elif $(call xpath,/*[local-name()="base64-binary" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"],$1); then { $(PRINTF) '%s\n' 'begin-base64 644 -'; $(call extracttext,$1) | $(TR) -d '\t\n\f\r '; $(PRINTF) '\n%s\n' '===='; } | $(UUDECODE) -o /dev/stdout > $(call quote,$2); elif $(call xpath,/*[local-name()="archive" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"],$1); then $(MAKE) -f $(call quote,$(abspath $(THISDIR)/GNUmakefile)) NAME=$(call quote,$3) SRC=$(call quote,$1) BUILDDIR=$(call quote,$(BUILDDIR)/archive/$3) DESTDIR=$(call quote,$(patsubst %/,%,$(dir $2))) MODE='urn:fdc:ladys.computer:20231231:Shu1She4:mode:archive' $(call quote,$2); else $(XMLLINT) --nsclean $(call quote,$1) > $(call quote,$2); fi
+override processresultto = if $(call xpath,/*[local-name()="raw-text" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"],$1); then $(call extracttext,$1) >|$(call quote,$2); elif $(call xpath,/*[local-name()="base64-binary" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"],$1); then { $(PRINTF) '%s\n' 'begin-base64 644 -'; $(call extracttext,$1) | $(TR) -d '\t\n\f\r '; $(PRINTF) '\n%s\n' '===='; } | $(UUDECODE) -o /dev/stdout >|$(call quote,$2); elif $(call xpath,/*[local-name()="archive" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"],$1); then $(MAKE) -f $(call quote,$(abspath $(THISDIR)/GNUmakefile)) NAME=$(call quote,$3) SRC=$(call quote,$1) BUILDDIR=$(call quote,$(BUILDDIR)/archive/$3) DESTDIR=$(call quote,$(patsubst %/,%,$(dir $2))) MODE='urn:fdc:ladys.computer:20231231:Shu1She4:mode:archive' $(call quote,$2); else $(FINALIZE) $(call quote,$1) >|$(call quote,$2); fi
 
 # ━ § BEGIN DEFAULT MAKE·FILE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 
@@ -305,14 +345,25 @@ ifeq ($(MODE),urn:fdc:ladys.computer:20231231:Shu1She4:mode:default)
 
 # ─ ¶ Non‐Recipe Variable Definitions ─────────────────────────────────
 
-# (callable) Test to see if the prerequisites provided by the second argument matches the value in the file corresponding to the first argument in `$(BUILDDIR)/lastprereqs´.
-# If not, save the new value and then add FORCE.
-# Return them regardless.
+# Non·empty if `help´ or `clean´, and no targets other than `help´ or `clean´, were specified as goals on the commandline.
+override notbuilding := $(and $(filter help clean,$(MAKECMDGOALS)),$(call not,$(filter-out help clean,$(MAKECMDGOALS))))
+
+# (callable) Tests to see if the prerequisites provided by the second argument matches the value in the file corresponding to the first argument in `$(BUILDDIR)/lastprereqs´.
+# If not, saves the new value.
+# Returns the values plus the file in `$(BUILDDIR)/lastprereqs´, which will always be newer than the target if there was a change.
 #
 # Calling this variable is useful when a given target should be updated whenever its list of prerequisites changes in addition to whenever there is a change to one of its prerequisites.
 #
+# If `$(notbuilding)´ is non·empty, this variable produces no result to avoid unnecessary work.
+#
 # ☡ This variable creates at least one subshell every time it is computed.
-override diffprereqs = $(if $(subst $(shell $(CAT) $(call quote,$(BUILDDIR)/lastprereqs/$1) 2> /dev/null || :),,$2),$2 FORCE$(and $(shell $(call ensuredirectory,$(BUILDDIR)/lastprereqs) && $(PRINTF) '%s\n' $(call quote,$2) > $(BUILDDIR)/lastprereqs/$1),),$2)
+override diffprereqs = $(if $(notbuilding),,$(and $(subst $(shell $(CAT) $(call quote,$(BUILDDIR)/lastprereqs/$1) 2>>/dev/null || :),,$2),$(shell $(call ensuredirectory,$(BUILDDIR)/lastprereqs) && $(PRINTF) '%s\n' $(call quote,$2) >|$(BUILDDIR)/lastprereqs/$1),)$2 $(BUILDDIR)/lastprereqs/$1)
+
+# (callable) Escape special characters for use in X·M·L.
+override xmlesc = $(subst >,&gt;,$(subst <,&lt;,$(subst &,&amp;,$1)))
+
+# (callable) Escape special characters for use in X·M·L attributes.
+override attresc = $(subst ",&quot;,$(call xmlesc,$1))
 
 # (callable) Escape special characters for use in sed regular expressions.
 override sedesc = $(subst /,[/],$(subst $$,\$$,$(subst *,\*,$(subst .,\.,$(subst [,\[,$(subst ^,\^,$(subst \,\\,$1)))))))
@@ -340,11 +391,16 @@ override perenc = $(shell $(PRINTF) '%s\n' $(foreach unencoded,$1,$(call quote,$
 # ☡ This variable creates a subshell every time it is computed.
 override pathenc = $(subst %2F,/,$(call perenc,$1))
 
+# (callable) Create a unique name for the given file, based on its absolute path.
+#
+# ☡ This variable creates a subshell every time it is computed.
+namehash = $(shell $(PRINTF) '%s' $(call quote,$(abspath $1)) | $(CKSUM) | $(SED) 's/ .*//' | $(XARGS) -E '' $(PRINTF) '%X')-$(notdir $1)
+
 # (overridable) Collect all of the applicable includes from the includes directory.
-sourceincludes := $(shell $(FIND) $(foreach dir,$(INCLUDEDIR),$(call quote,$(dir))) '(' $(FINDRULES) ')' -a -type f)
+sourceincludes := $(if $(and $(INCLUDEDIR),$(wildcard $(INCLUDEDIR))),$(patsubst ./%,%,$(shell $(FIND) $(foreach dir,$(INCLUDEDIR),$(call quote,$(dir))) '(' $(FINDINCLUDERULES) ')' -a -type f -a -print)),)
 
 # (overridable) Collect all of the applicable source files from the source directory, removing any which are also includes.
-sourcefiles := $(filter-out $(sourceincludes),$(shell $(FIND) $(foreach dir,$(SRCDIR),$(call quote,$(dir))) '(' $(FINDRULES) ')' -a -type f))
+sourcefiles := $(if $(and $(SRCDIR),$(wildcard $(SRCDIR))),$(filter-out $(sourceincludes),$(patsubst ./%,%,$(shell $(FIND) $(foreach dir,$(SRCDIR),$(call quote,$(dir))) '(' $(FINDRULES) ')' -a -type f -a -print))))
 
 # Figure out the file type of each source file and source include.
 ifneq ($(wildcard $(BUILDDIR)/magic.mgc),)
@@ -353,7 +409,7 @@ endif
 
 # Get the list of supported plaintext file types from the parser.
 ifneq ($(wildcard $(BUILDDIR)/parser.xslt),)
-override plaintexttypes := $(filter-out $(XMLTYPES),$(shell $(XMLLINT) --xpath '/*/*[@name="书社:parsers"]//*[namespace-uri()="http://www.w3.org/1999/xhtml" and local-name()="dd"]/text()' $(call quote,$(BUILDDIR)/parser.xslt)))
+override plaintexttypes := $(filter-out $(XMLTYPES),$(shell $(XMLLINT) --noent --nonet --xpath '/*/*[@name="书社:parsers"]//*[namespace-uri()="http://www.w3.org/1999/xhtml" and local-name()="dd"]/text()' $(call quote,$(BUILDDIR)/parser.xslt)))
 endif
 
 # (callable) Get all of the files (source and includes) which have the provided types.
@@ -367,10 +423,10 @@ override plaintextfiles := $(filter-out $(xmlfiles),$(call filesoftype,$(plainte
 override assetfiles := $(filter-out $(xmlfiles) $(plaintextfiles),$(sourcefiles) $(sourceincludes))
 
 # (callable) Get the types of the given files.
-override typeoffile = $(foreach file,$1,$(patsubst $(file)|%,%,$(filter $(file)|%,$(types))))
+override typeoffile = $(foreach file,$1,$(or $(patsubst $(file)|%,%,$(filter $(file)|%,$(types))),application/octet-stream))
 
 # Pair each source magic file with its location in the build directory.
-override magicpair := $(foreach magicfile,$(MAGIC),$(magicfile)|$(BUILDDIR)/magic/$(notdir $(magicfile)))
+override magicpair := $(foreach magicfile,$(MAGIC),$(magicfile)|$(BUILDDIR)/magic/$(call namehash,$(magicfile)))
 
 # (callable) Get the source file for the given magic files.
 override magicsource = $(foreach magicpath,$1,$(patsubst %|$(magicpath),%,$(firstword $(filter %|$(magicpath),$(magicpair)))))
@@ -379,10 +435,10 @@ override magicsource = $(foreach magicpath,$1,$(patsubst %|$(magicpath),%,$(firs
 override magicfile = $(foreach file,$1,$(patsubst $(file)|%,%,$(filter $(file)|%,$(magicpair))))
 
 # (callable) Get the local path for the given source file.
-override sourcepath = $(firstword $(foreach directory,$(SRCDIR),$(if $(filter $(directory)/%,$1),$(patsubst $(directory)/%,%,$1),)))
+override sourcepath = $(or $(firstword $(foreach directory,$(SRCDIR),$(if $(filter .,$(directory)),$(wildcard $1),$(if $(filter $(directory)/%,$1),$(patsubst $(directory)/%,%,$1),)))),$(error Unable to get local path for source file `$1´))
 
 # (callable) Get the local path for the given include.
-override includepath = $(firstword $(foreach directory,$(INCLUDEDIR),$(if $(filter $(directory)/%,$1),$(patsubst $(directory)/%,%,$1),)))
+override includepath = $(or $(firstword $(foreach directory,$(INCLUDEDIR),$(if $(filter .,$(directory)),$(wildcard $1),$(if $(filter $(directory)/%,$1),$(patsubst $(directory)/%,%,$1),)))),$(error Unable to get local path for include file `$1´))
 
 # (callable) Get base64 data u·r·i’s for the given files.
 #
@@ -402,7 +458,16 @@ override sourcefile = $(foreach local,$1,$(patsubst %|$(local),%,$(filter %|$(lo
 #
 # This file is created before a reload due to type changes, and is removed after.
 # This ensures that file classifications are up·to·date immediately after the reload.
-override typeupdates := $(if $(wildcard $(BUILDDIR)/.update-types),FORCE,)
+override typeupdates := $(and $(wildcard $(BUILDDIR)/.update-types),FORCE)
+
+# Pair each source file and include with its metadata location.
+override sourcemetadatapair := $(foreach file,$(sourcefiles) $(sourceincludes),$(file)|$(BUILDDIR)/$(if $(filter $(file),$(sourceincludes)),includes.metadata/$(call includepath,$(file)),sources.metadata/$(call sourcepath,$(file))))
+
+# (callable) Get the location of the transformed X·M·L files for the given source files.
+override metadata = $(foreach file,$1,$(patsubst $(file)|%,%,$(filter $(file)|%,$(sourcemetadatapair))))
+
+# (callable) Get the source files for the given parsed file.
+override datadata = $(foreach file,$1,$(patsubst %|$(file),%,$(filter %|$(file),$(sourcemetadatapair))))
 
 # Pair each source file and include with its parsed location.
 override sourceparsedpair := $(foreach file,$(sourcefiles) $(sourceincludes),$(file)|$(BUILDDIR)/$(if $(filter $(file),$(sourceincludes)),includes/$(call includepath,$(file)),sources/$(call sourcepath,$(file))))
@@ -413,15 +478,15 @@ override parsed = $(foreach file,$1,$(patsubst $(file)|%,%,$(filter $(file)|%,$(
 # (callable) Get the source files for the given parsed file.
 override unparsed = $(foreach file,$1,$(patsubst %|$(file),%,$(filter %|$(file),$(sourceparsedpair))))
 
-# Pair each parser, transform, or parsed file with its file u·r·i.
-override fileuripairs := $(join $(patsubst %,%|,$(PARSERS) $(TRANSFORMS) $(call parsed,$(sourcefiles) $(sourceincludes))),$(call pathenc,$(foreach uriable,$(PARSERS) $(TRANSFORMS) $(call parsed,$(sourcefiles) $(sourceincludes)),file://$(abspath $(uriable)))))
+# Pair each build directory, parser, transform, source file, or parsed file with its file u·r·i.
+override fileuripairs := $(join $(patsubst %,%|,$(BUILDDIR) $(PARSERS) $(TRANSFORMS) $(sourcefiles) $(sourceincludes) $(call parsed,$(sourcefiles) $(sourceincludes))),$(call pathenc,$(foreach uriable,$(BUILDDIR) $(PARSERS) $(TRANSFORMS) $(sourcefiles) $(sourceincludes) $(call parsed,$(sourcefiles) $(sourceincludes)),file://$(abspath $(uriable)))))
 
-# (callable) Get the file u·r·is for the given parsers, transforms, or parsed files.
-override fileuri = $(foreach file,$1,$(patsubst $(file)|%,%,$(filter $(file)|%,$(fileuripairs))))
+# (callable) Get the file u·r·is for the given parsers, transforms, source file or parsed files.
+override fileuri = $(foreach file,$1,$(or $(patsubst $(file)|%,%,$(filter $(file)|%,$(fileuripairs))),$(error Unable to get file u·r·i for `$(file)´)))
 
 ifneq ($(wildcard $(BUILDDIR)/dependencies),)
 # Pair each file with a list of dependencies for it.
-override dependenciesforfile := $(foreach file,$(filter-out $(assetfiles),$(sourcefiles) $(sourceincludes)),$(file)|$(subst $(space),|,$(shell $(CAT) $(call quote,$(BUILDDIR)/dependencies) | $(SED) $(call quote,/^$(call sedesc,$(call localuri,$(file)))$$/$(comma)/^[^	]/!d;/^	/!d;s/^	//))))
+override dependenciesforfile := $(foreach file,$(filter-out $(assetfiles),$(sourcefiles) $(sourceincludes)),$(file)|$(subst $(space),|,$(shell $(SED) $(call quote,/^$(call sedesc,$(call localuri,$(file)))$$/$(comma)/^[^	]/!d;/^	/!d;s/^	//) <$(call quote,$(BUILDDIR)/dependencies))))
 
 # (callable) Get the list of dependency leiris for the given source files.
 #
@@ -429,9 +494,13 @@ override dependenciesforfile := $(foreach file,$(filter-out $(assetfiles),$(sour
 override dependencyuris = $(foreach file,$1,$(subst |, ,$(patsubst $(file)|%,%,$(filter $(file)|%,$(dependenciesforfile)))))
 
 # (callable) Get the list of recursive dependencies for the given source files.
+#
+# If the file cannot have dependencies (e·g is an asset file), the resulting value will be the empty string.
 override recursives = $(foreach uri,$(filter -%,$(call dependencyuris,$1)),$(call sourcefile,$(patsubst -%,%,$(uri))))
 
 # (callable) Get the list of (nonrecursive) dependencies for the given source files.
+#
+# If the file cannot have dependencies (e·g is an asset file), the resulting value will be the empty string.
 override dependencies = $(foreach uri,$(filter-out -%,$(call dependencyuris,$1)),$(call sourcefile,$(uri)))
 endif
 
@@ -453,10 +522,13 @@ ifneq ($(wildcard $(BUILDDIR)/destinations),)
 override destinations := $(shell $(CAT) $(BUILDDIR)/destinations)
 
 # Pair source files and their destinations.
-override sourcedestinationpair := $(foreach destination,$(destinations),$(call sourcefile,$(firstword $(subst |, ,$(destination))))|$(call perdec,$(subst $(space),|,$(wordlist 2,$(words $(subst |, ,$(destination))),$(subst |, ,$(destination))))))
+override sourcedestinationpair := $(foreach destination,$(destinations),$(call sourcefile,$(firstword $(subst |, ,$(destination))))|$(subst $(space),|,$(wordlist 2,$(words $(subst |, ,$(destination))),$(subst |, ,$(destination)))))
+endif
 
-# (callable) Get the destination for the given source files.
-override destination = $(foreach file,$1,$(patsubst $(file)|%,%,$(filter $(file)|%,$(sourcedestinationpair))))
+# (callable) Get the destination for the given source files, or return `.NOTDEF/$1´.
+#
+# The fallback here is because destinations are used to generate targets and thus must always be non·empty and should be unique, even when they haven’t been generated yet.
+override destination = $(foreach file,$1,$(or $(patsubst $(file)|%,%,$(filter $(file)|%,$(sourcedestinationpair))),.NOTDEF/$1))
 
 # Pair each source file with its compiled location.
 override sourcecompiledpair := $(foreach file,$(sourcefiles),$(file)|$(BUILDDIR)/results/$(call destination,$(file)))
@@ -475,22 +547,24 @@ override unbuilt = $(foreach file,$1,$(call uncompiled,$(patsubst $(BUILDDIR)/pu
 
 # (callable) Get the installed locations for the given source files.
 override installed = $(foreach file,$1,$(DESTDIR)/$(call destination,$(file)))
-endif
 
 # ─ ¶ Recipe Variable Definitions ─────────────────────────────────────
 
 # (callable) Get the identifier for the given parser or transform.
-override id = $(XMLLINT) --xpath '/*/*[local-name()="id" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"]/text()[1]' $(call quote,$1) 2> /dev/null || $(PRINTF) '%s\n' $(call quote,about:shushe?$(or $2,unknown)=$(call pathenc,$(basename $(notdir $1))))
+override id = $(XMLLINT) --noent --nonet --xpath '/*/*[local-name()="id" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"]/text()[1]' $(call quote,$1) 2>>/dev/null || $(PRINTF) '%s\n' $(call quote,about:shushe?$(or $2,unknown)=$(call pathenc,$(basename $(notdir $1))))
 
 # (callable) Sanitize and wrap the provided plaintext file in X·M·L, printing to `stdout´.
-override wrapplaintext = { $(PRINTF) '%s\n%s' '<?xml version="1.0"?>' '<script xmlns="http://www.w3.org/1999/xhtml" type="$(call typeoffile,$1)"><![CDATA['; $(TR) '\000\013\014' '\032\011\012' < $(call quote,$1) | $(SED) "$$($(PRINTF) '%b' 's/]]>/]]]]><!\\[CDATA\\[>/g\ns/\0357\0277\0276/�/g\ns/\0357\0277\0277/�/g\n$$!s/\\r$$//g\ns/\\r/\\n/g\n$$!s/\0302\0205$$//g\ns/\0302\0205/\\n/g\ns/\0342\0200\0250/\\n/g\ns/[\0001\0002\0003\0004\0005\0006\0007\0010]/�/g\ns/[\0016\0017\0020\0021\0022\0023\0024\0025\0026\0027\0031\0032\0033\0034\0035\0036\0037]/�/g')"; $(PRINTF) '%s\n' ']]></script>'; }
+override wrapplaintext = { $(PRINTF) '%s\n%s' '<?xml version="1.0"?>' '<script xmlns="http://www.w3.org/1999/xhtml" type="$(call typeoffile,$1)"><![CDATA['; $(TR) '\000\013\014' '\032\011\012' <$(call quote,$1) | $(SED) "$$($(PRINTF) '%b' 's/]]>/]]]]><!\\[CDATA\\[>/g\ns/\0357\0277\0276/�/g\ns/\0357\0277\0277/�/g\n$$!s/\\r$$//g\ns/\\r/\\n/g\n$$!s/\0302\0205$$//g\ns/\0302\0205/\\n/g\ns/\0342\0200\0250/\\n/g\ns/[\0001\0002\0003\0004\0005\0006\0007\0010]/�/g\ns/[\0016\0017\0020\0021\0022\0023\0024\0025\0026\0027\0031\0032\0033\0034\0035\0036\0037]/�/g')"; $(PRINTF) '%s\n' ']]></script>'; }
 
 # (callable) Check if the provided X·M·L file is X·M·L 1.1, and if so, coerce to X·M·L 1.0 as best as possible, printing the result (or the original file contents) to `stdout´.
 #
 # The X·M·L declaration will be dropped and character escapes for C0 control codes will be replaced with a literal `U+0091 PRIVATE USE ONE´, which is invalid in X·M·L 1.1, but valid X·M·L 1.0 (making the replacement obvious).
 #
 # This isn’t a perfect substitution (it makes some assumptions about the format of the underlying X·M·L), but it should be workable for most sensible, welformed files.
-override serializexml = $(SED) "$$($(PRINTF) '%b' '/<?xml[ \t]\\{1,\\}version=[\0042\0047]1.1/,$${ s/<?xml[^>]*?>/<!--<?xml version=\00421.1\0042?>-->/\n s/&\0043x0*[12345678BCEFbcef];/\0302\0221/g\n s/&\0043x0*1[0123456789ABCDEFabcdef];/\0302\0221/g\n s/&\00430*[12345678];/\0302\0221/g\n s/&\00430*1[12456789];/\0302\0221/g\n s/&\00430*2[0123456789];/\0302\0221/g\n s/&\00430*3[01];/\0302\0221/g\n}')" < $(call quote,$1) | $(SED) "$$($(PRINTF) '%b' ':a\n/^\\n*$$/{ $$d\n N\n ba\n}')"
+override serializexml = $(SED) "$$($(PRINTF) '%b' '/<?xml[ \t]\\{1,\\}version=[\0042\0047]1.1/,$${ s/<?xml[^>]*?>/<!--<?xml version=\00421.1\0042?>-->/\n s/&\0043x0*[12345678BCEFbcef];/\0302\0221/g\n s/&\0043x0*1[0123456789ABCDEFabcdef];/\0302\0221/g\n s/&\00430*[12345678];/\0302\0221/g\n s/&\00430*1[12456789];/\0302\0221/g\n s/&\00430*2[0123456789];/\0302\0221/g\n s/&\00430*3[01];/\0302\0221/g\n}')" <$(call quote,$1) | $(SED) "$$($(PRINTF) '%b' ':a\n/^\\n*$$/{ $$d\n N\n ba\n}')"
+
+# (callable) Wraps the provided shell script in a conditional which checks whether a make restart caused by `$(BUILDDIR)/.update-types´ is imminent (i·e, it was created during the course of this run) and only executes the script if it is not.
+override unlesstypeswillupdate = $(if $(call not,$(typeupdates)),if $(TEST) ! -e $(call quote,$(BUILDDIR)/.update-types); then ,)$1$(and $(call not,$(typeupdates)),; fi)
 
 # ─ ¶ Phony Targets ───────────────────────────────────────────────────
 
@@ -513,7 +587,7 @@ install : $(call installed,$(recursivefiles) $(installablefiles)) ;
 
 # List all source files and includes and their computed types.
 list :
-	@$(PRINTF) '%b' $(call quote,$(foreach file,$(sort $(sourcefiles)) $(sort $(sourceincludes)),\0033[1m$(file)\0033[22m|$(call typeoffile,$(file))|[\0033[3m$(if $(filter $(file),$(xmlfiles)),xml,$(if $(filter $(file),$(plaintextfiles)),text,asset))$(if $(filter $(file),$(sourceincludes)),|include,)\0033[23m] Modified:|$(call modtime,$(file))$(if $(call dependencies,$(file))$(call recursives,$(file)), $(strip $(foreach recursive,$(call recursives,$(file)),\0033[93;41m•|Recursive|Dependency|\0033[39;49m|$(recursive)) $(foreach dependency,$(call dependencies,$(file)),\0033[2m•|Dependency|\0033[22m|$(dependency))))$(if $(filter $(file),$(sourcefiles)), →|<\0033[4m/$(call destination,$(file))\0033[24m>,) )) | $(TR) ' |' '\n '
+	@$(PRINTF) '%b' $(call quote,$(foreach file,$(sort $(sourcefiles)) $(sort $(sourceincludes)),\0033[1m$(file)\0033[22m|$(call typeoffile,$(file))|[\0033[3m$(if $(filter $(file),$(xmlfiles)),xml,$(if $(filter $(file),$(plaintextfiles)),text,asset))$(if $(filter $(file),$(sourceincludes)),|include,)\0033[23m]$(if $(call dependencies,$(file))$(call recursives,$(file)), $(strip $(foreach recursive,$(call recursives,$(file)),\0033[93;41m•|Recursive|Dependency|\0033[39;49m|$(recursive)) $(foreach dependency,$(call dependencies,$(file)),\0033[2m•|Dependency|\0033[22m|$(dependency))))$(if $(filter $(file),$(sourcefiles)), →|<\0033[4m/$(call destination,$(file))\0033[24m>,) )) | $(TR) ' |' '\n '
 
 # Lists out the destinations of all resulting files (relative to `DESTDIR´).
 listout :
@@ -538,39 +612,19 @@ FORCE : ;
 # Don’t use any implicit rules.
 .SUFFIXES : ;
 
-# Phony rules; always consider these out·of·date.
-.PHONY : FORCE all default clean gone info install list listout uninstall $(call built,$(recursivefiles)) ;
+# Don’t delete these files even if Make is stopped in the process of rebuilding them.
+.PRECIOUS : $(THISDIR)/GNUmakefile ;
 
-ifneq ($(typeupdates)$(wildcard $(BUILDDIR)/dependencies)$(wildcard $(BUILDDIR)/destinations),)
-# Reload this make·file if the dependency graph or output destinations have changed.
-#
-# The dependency graph and output destinations are used to set the values of variables in this make·file, so it’s important to ensure that they are actually up·to·date prior to executing any later rules.
-#
-# This recipe only exists after types have been updated or when the dependency graph or destinations file already exists.
-#
-# ※ There is a chance that generating the dependencies will also update the parsers.
-$(THISDIR)/GNUmakefile :: $(BUILDDIR)/dependencies $(BUILDDIR)/destinations
-	$(silent)$(TOUCH) $(THISDIR)/GNUmakefile
-ifeq ($(typeupdates),)
-	$(call inform,if $(TEST) ! -f $(call quote,$(BUILDDIR)/.update-types); then $(PRINTF) '%b\n' '\0033[1mDependency graph and output destinations updated. Restarting…\0033[22m' >&2; fi)
-else
-	$(silent)$(RM) $(call quote,$(BUILDDIR)/.update-types)
-	$(call inform,$(PRINTF) '%b\n' '\0033[1mDependency graph and output destinations updated. Restarting…\0033[22m' >&2)
-endif
-endif
+# Phony rules; always consider these out·of·date.
+.PHONY : FORCE all clean gone help install list listout uninstall $(call built,$(recursivefiles)) ;
 
-ifeq ($(typeupdates),)
-# Reload this make·file if any of the magic files or parsers have changed.
-#
-# These are used to classify source files, so if they have changed then the make·file must be reloaded.
+ifeq ($(notbuilding),)
+# Reload this make·file if the magic file, parser, dependencies, or destinations have changed.
 #
-# This recipe sleeps for one second to ensure that files built after the restart have a more current time·stamp.
-$(THISDIR)/GNUmakefile :: $(BUILDDIR)/magic.mgc $(BUILDDIR)/parser.xslt
+# If the magic file or parser changed, then another restart will be required, as the dependencies and destinations will need to be regenerated.
+$(THISDIR)/GNUmakefile : $(BUILDDIR)/magic.mgc $(BUILDDIR)/parser.xslt $(BUILDDIR)/dependencies $(BUILDDIR)/destinations
 	$(silent)$(TOUCH) $(THISDIR)/GNUmakefile
-	$(silent)$(RM) -f $(call quote,$(BUILDDIR)/dependencies) $(call quote,$(BUILDDIR)/destinations)
-	$(call inform,$(PRINTF) '%b\n' '\0033[1mMagic file or parsers have updated. Restarting…\0033[22m' >&2)
-	$(silent)$(SLEEP) 1
-	$(silent)$(TOUCH) $(call quote,$(BUILDDIR)/.update-types)
+	$(if $(filter $(BUILDDIR)/magic.mgc $(BUILDDIR)/parser.xslt,$?),$(call inform,$(PRINTF) '%b\n' '\0033[1mMagic file or parsers have updated. Restarting…\0033[22m' >&2)$(newline)$(silent)$(SLEEP) 1,$(if $(typeupdates),$(silent)$(RM) $(call quote,$(BUILDDIR)/.update-types)$(newline),)$(call inform,$(PRINTF) '%b\n' '\0033[1mDependency graph and output destinations updated. Restarting…\0033[22m' >&2))
 endif
 
 # ─ ¶ Build Targets ───────────────────────────────────────────────────
@@ -597,55 +651,49 @@ $(BUILDDIR)/parser.catalog : $(call diffprereqs,parsers,$(sort $(PARSERS)))
 	$(foreach parser,$(PARSERS),$(silent){ $(call id,$(parser)); $(PRINTF) '%s\n' $(call quote,$(call fileuri,$(parser))) '--noout' $(call quote,$@); } | $(xargsmultiquote) | $(XARGS) -E '' $(XMLCATALOG) --add uri$(newline))
 $(BUILDDIR)/parser.xslt : $(BUILDDIR)/parser.catalog $(THISDIR)/lib/catalog2parser.xslt
 	$(call inform,$(PRINTF) '%s\n' 'Generating main parser…' >&2)
-	$(silent)$(XSLTPROC) --nonet --novalid -o $(call quote,$@) $(call quote,$(THISDIR)/lib/catalog2parser.xslt) $(call quote,$<)
+	$(silent)$(XSLTPROC) --nonet --novalid --nomkdir --nowrite $(call quote,$(THISDIR)/lib/catalog2parser.xslt) $(call quote,$<) >|$(call quote,$@)
 	$(silent)$(TOUCH) $(call quote,$(BUILDDIR)/.update-types)
 
+# Generate R·D·F metadata for files.
+#
+# If the types have been updated but `typeupdates´ is not active, this recipe is skipped because a restart is forthcoming.
+$(call metadata,$(sourcefiles) $(sourceincludes)) : % : $$(call datadata,$$@) $(THISDIR)/.metadata-format-changed-since $(typeupdates)
+	$(call inform,$(call unlesstypeswillupdate,$(PRINTF) '%s\n' $(call quote,Generating metadata for `$<´…) >&2))
+	$(silent)$(call unlesstypeswillupdate,$(call ensuredirectory,$(dir $@)); { if $(TEST) ! -f $(call quote,$(BUILDDIR)/.mtime); then $(PRINTF) '%b' '\n' >|$(call quote,$(BUILDDIR)/.mtime); fi; $(TOUCH) -r $(call quote,$<) $(call quote,$(BUILDDIR)/.mtime); $(DIFF) -u $(call quote,$(BUILDDIR)/.mtime) /dev/null | $(SED) '1!d;s/.*	\([^ ]*\) \([^ ]*\).*$$/\1T\2Z/'; $(CKSUM) $(call quote,$<) | $(SED) 's/[ ].*//'; } | $(xargsmultiquote) | $(XARGS) -E '' $(PRINTF) '<?xml version="1.0"?><书社vocab:$(if $(filter $<,$(sourceincludes)),IncludeFile,SourceFile) xmlns:nie="http://www.semanticdesktop.org/ontologies/2007/01/19/nie#" xmlns:nfo="http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:书社vocab="urn:fdc:ladys.computer:20231231:Shu1She4:vocab:" rdf:about="%s" 书社vocab:path="%s" nfo:fileUrl="%s"><nie:interpretedAs>$(if $(filter $<,$(assetfiles)),<nfo:InformationElement nie:mimeType="%s"/>,<nfo:PlainTextDocument nie:mimeType="%s"/>)</nie:interpretedAs><书社vocab:hasParsedFile nfo:fileUrl="%s"/><nfo:fileLastModified rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">%s</nfo:fileLastModified><nfo:hasHash nfo:hashAlgorithm="CRC32" nfo:hashValue="%s"/></书社vocab:$(if $(filter $<,$(sourceincludes)),IncludeFile,SourceFile)>' $(call quote,$(call attresc,$(call localuri,$<))) $(call quote,$(call attresc,$(if $(filter $<,$(sourceincludes)),$(call includepath,$<),$(call sourcepath,$<)))) $(call quote,$(call attresc,$(call fileuri,$<))) $(call quote,$(call attresc,$(call typeoffile,$<))) $(call quote,$(call attresc,$(call fileuri,$(call parsed,$<)))) >|$(call quote,$@))
+
 # Parse the files.
 #
 # Even plain X·M·L files are parsed, because they may contain X·H·T·M·L `<script>´ elements which contain other kinds of data.
 # Asset files are turned into H·T·M·L embeds pointing to `data:´ U·R·I’s.
-$(call parsed,$(sourcefiles) $(sourceincludes)) : % : $$(call unparsed,$$@) $(BUILDDIR)/parser.xslt $(typeupdates)
-	$(call inform,$(PRINTF) '%s\n' $(call quote,Processing `$<´…) >&2)
-	$(silent)$(call ensuredirectory,$(dir $@))
-	$(silent)$(if $(filter $<,$(assetfiles)),$(PRINTF) '%s\n' $(call quote,<?xml version="1.0"?><object xmlns="http://www.w3.org/1999/xhtml" type="$(call typeoffile,$<)" data="$(call datauri,$<)"/>) > $(call quote,$@),$(if $(filter $<,$(plaintextfiles)),$(call wrapplaintext,$<),$(call serializexml,$<)) | $(XSLTPROC) --nonet --novalid -o $(call quote,$@) --stringparam BUILDTIME $$($(DATE) -u '+%Y-%m-%dT%H:%M:%SZ') --stringparam IDENTIFIER $(call quote,$(call localuri,$<)) --stringparam SRCTIME '$(call modtime,$<)' --stringparam CKSUM $$($(CKSUM) $(call quote,$<) | $(SED) 's/[ ].*//')$(if $(THISREV), --stringparam THISREV $(call quote,$(THISREV)),)$(if $(SRCREV), --stringparam SRCREV $(call quote,$(SRCREV)),) $(call quote,$(BUILDDIR)/parser.xslt) -)
-
-# Generate a catalog of all parsed files, for use when processing includes.
 #
-# This does not depend on actually transforming the files.
-$(BUILDDIR)/catalog : $(call diffprereqs,sources,$(sort $(sourcefiles) $(sourceincludes))) $(typeupdates)
-	$(call inform,$(PRINTF) '%s\n' 'Generating catalog of parsed files…' >&2)
-	$(silent)$(XMLCATALOG) --create --noout $(call quote,$@)
-	$(foreach source,$(sourcefiles) $(sourceincludes),$(silent)$(XMLCATALOG) --add uri $(call quote,$(call localuri,$(source))) $(call quote,$(call fileuri,$(call parsed,$(source)))#$(if $(filter $(source),$(assetfiles)),asset,xml)) --noout $(call quote,$@)$(newline))
+# If the types have been updated but `typeupdates´ is not active, this recipe is skipped because a restart is forthcoming.
+$(call parsed,$(sourcefiles) $(sourceincludes)) : % : $$(call unparsed,$$@) $(BUILDDIR)/parser.xslt $(PARSERLIBS) $(typeupdates)
+	$(call inform,$(call unlesstypeswillupdate,$(PRINTF) '%s\n' $(call quote,Processing `$<´…) >&2))
+	$(silent)$(call unlesstypeswillupdate,$(call ensuredirectory,$(dir $@)); $(if $(filter $<,$(assetfiles)),$(PRINTF) '%s\n' $(call quote,<?xml version="1.0"?><object xmlns="http://www.w3.org/1999/xhtml" type="$(call typeoffile,$<)" data="$(call datauri,$<)"/>) >|$(call quote,$@),$(if $(filter $<,$(plaintextfiles)),$(call wrapplaintext,$<),$(call serializexml,$<)) | $(XSLTPROC) --nonet --novalid --nomkdir --nowrite --stringparam BUILDTIME $$($(DATE) -u '+%Y-%m-%dT%H:%M:%SZ') --stringparam IDENTIFIER $(call quote,$(call localuri,$<))$(if $(THISREV), --stringparam THISREV $(call quote,$(THISREV)),)$(if $(SRCREV), --stringparam SRCREV $(call quote,$(SRCREV)),) $(call quote,$(BUILDDIR)/parser.xslt) - >|$(call quote,$@)))
 
-# Build a list of dependencies for each parsed file.
-$(BUILDDIR)/dependencies : $(BUILDDIR)/catalog $(call parsed,$(plaintextfiles) $(xmlfiles)) $(THISDIR)/lib/catalog2dependencies.xslt
-	$(call inform,$(PRINTF) '%s\n' 'Identifying dependencies…' >&2)
-	$(silent)$(TOUCH) $(call quote,$@)
-	$(silent)$(XSLTPROC) --nonet --novalid -o $(call quote,$@) $(call quote,$(THISDIR)/lib/catalog2dependencies.xslt) $(call quote,$<)
-
-# Generate a catalog of destinations for files.
+# Collect the metadata into a single file, and generate the dependencies and destinations files as side·effects.
+#
+# Doing this all in one step reduces the number of calls to `xsltproc´ required, but requires that it be called from the build directory (necessitating a subshell).
 #
-# This depends on parsing non·asset source files, but not assets or includes.
-# It does not require knowing the dependencies.
-$(BUILDDIR)/destinations : $(BUILDDIR)/catalog $(call parsed,$(filter-out $(assetfiles),$(sourcefiles))) $(THISDIR)/lib/catalog2destinations.xslt
-	$(call inform,$(PRINTF) '%s\n' 'Identifying output destinations…' >&2)
-	$(silent)$(TOUCH) $(call quote,$@)
-	$(silent)$(XSLTPROC) --nonet --novalid -o $(call quote,$@) $(call quote,$(THISDIR)/lib/catalog2destinations.xslt) $(call quote,$<)
+# If the types have been updated but `typeupdates´ is not active, this recipe is skipped because a restart is forthcoming.
+$(BUILDDIR)/dependencies $(BUILDDIR)/destinations $(BUILDDIR)/metadata : $(call diffprereqs,metadatas,$(call metadata,$(sort $(sourcefiles) $(sourceincludes)))) $(call parsed,$(filter-out $(assetfiles),$(sourcefiles) $(sourceincludes))) $(THISDIR)/lib/expandmetadata.xslt
+	$(call inform,$(call unlesstypeswillupdate,$(PRINTF) '%s\n' 'Compiling metadata…' >&2))
+	$(silent)$(call unlesstypeswillupdate,{ $(PRINTF) '<?xml version="1.0"?><rdf:RDF xmlns:nie="http://www.semanticdesktop.org/ontologies/2007/01/19/nie#" xmlns:nfo="http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:书社vocab="urn:fdc:ladys.computer:20231231:Shu1She4:vocab:"><书社vocab:BuildDirectory nfo:fileUrl="%s"/>' $(call quote,$(call attresc,$(call fileuri,$(BUILDDIR)))); {$(foreach meta,$(call metadata,$(sort $(sourcefiles) $(sourceincludes))), $(CAT) $(call quote,$(meta));) } | $(SED) 's/<?xml version="1.0"?>//g'; $(PRINTF) '%s\n' '</rdf:RDF>'; } | ( $(CD) $(call quote,$(BUILDDIR)); $(XSLTPROC) --nonet --novalid --nomkdir $(call quote,$(abspath $(THISDIR)/lib/expandmetadata.xslt)) - ) | $(XMLLINT) --nonet --nsclean - >|$(call quote,$(BUILDDIR)/metadata))
 
 # Generate the main transform.
 $(BUILDDIR)/transform.catalog : $(call diffprereqs,transforms,$(sort $(TRANSFORMS)))
 	$(call inform,$(PRINTF) '%s\n' 'Generating catalog of transforms…' >&2)
 	$(silent)$(XMLCATALOG) --create --noout $(call quote,$@)
 	$(foreach transform,$(TRANSFORMS),$(silent){ $(call id,$(transform)); $(PRINTF) '%s\n' $(call quote,$(call fileuri,$(transform))) '--noout' $(call quote,$@); } | $(xargsmultiquote) | $(XARGS) -E '' $(XMLCATALOG) --add uri$(newline))
-$(BUILDDIR)/transform.xslt : $(BUILDDIR)/transform.catalog $(THISDIR)/lib/catalog2transform.xslt
+$(BUILDDIR)/transform.xslt : $(BUILDDIR)/transform.catalog $(BUILDDIR)/metadata $(THISDIR)/lib/literally.xslt $(THISDIR)/lib/catalog2transform.xslt
 	$(call inform,$(PRINTF) '%s\n' 'Generating main transform…' >&2)
-	$(silent)$(XSLTPROC) --nonet --novalid -o $(call quote,$@) $(call quote,$(THISDIR)/lib/catalog2transform.xslt) $(call quote,$<)
+	$(silent)$(XSLTPROC) --nonet --novalid --nomkdir --nowrite --stringparam METADATA $(call quote,$(call fileuri,$(BUILDDIR))/metadata) $(call quote,$(THISDIR)/lib/catalog2transform.xslt) $(call quote,$<) >|$(call quote,$@)
 
 # Compile the result files using the dependencies as necessary.
-$(call compiled,$(compilablefiles)) : $(BUILDDIR)/results/% : $$(call parsed,$$(call uncompiled,$$@)) $(BUILDDIR)/transform.xslt $$(call parsed,$$(call dependencies,$$(call uncompiled,$$@)))
+$(call compiled,$(compilablefiles)) : $(BUILDDIR)/results/% : $$(call parsed,$$(call uncompiled,$$@)) $$(call parsed,$$(call dependencies,$$(call uncompiled,$$@))) $(BUILDDIR)/transform.xslt $(TRANSFORMLIBS) $(BUILDDIR)/metadata
 	$(call inform,$(PRINTF) '%s\n' $(call quote,Compiling </$*>…) >&2)
 	$(silent)$(call ensuredirectory,$(dir $@))
-	$(silent)$(XSLTPROC) --nonet --novalid -o $(call quote,$@) --stringparam CATALOG 'catalog' --stringparam BUILDTIME $$($(DATE) -u '+%Y-%m-%dT%H:%M:%SZ') --stringparam SRCTIME '$(call modtime,$(call uncompiled,$@))' --stringparam IDENTIFIER $(call quote,$(call localuri,$(call uncompiled,$@))) --stringparam PATH $(call quote,/$*) --stringparam CKSUM $$($(CKSUM) $(call quote,$(call uncompiled,$@)) | $(SED) 's/[ ].*//')$(if $(THISREV), --stringparam THISREV $(call quote,$(THISREV)),)$(if $(SRCREV), --stringparam SRCREV $(call quote,$(SRCREV)),) $(call quote,$(BUILDDIR)/transform.xslt) $(call quote,$<)
+	$(silent)$(XSLTPROC) --nonet --novalid --nomkdir --nowrite --stringparam METADATA 'metadata' --stringparam BUILDTIME $$($(DATE) -u '+%Y-%m-%dT%H:%M:%SZ') --stringparam IDENTIFIER $(call quote,$(call localuri,$(call uncompiled,$@)))$(if $(THISREV), --stringparam THISREV $(call quote,$(THISREV)),)$(if $(SRCREV), --stringparam SRCREV $(call quote,$(SRCREV)),) $(call quote,$(BUILDDIR)/transform.xslt) $(call quote,$<) >|$(call quote,$@)
 
 # Create the final files from the compiled results (or error in the case of recursive ones).
 $(call built,$(compilablefiles)) : $(BUILDDIR)/public/% : $(BUILDDIR)/results/%
@@ -683,6 +731,12 @@ endif
 
 # ─ ¶ Special Targets ─────────────────────────────────────────────────
 
+# Don’t use any implicit rules.
+.SUFFIXES : ;
+
+# Don’t delete these files even if Make is stopped in the process of rebuilding them.
+.PRECIOUS : $(THISDIR)/GNUmakefile ;
+
 # Reload this make·file if the archive components have changed.
 $(THISDIR)/GNUmakefile : $(BUILDDIR)/index
 	$(silent)$(TOUCH) $(THISDIR)/GNUmakefile
@@ -693,15 +747,18 @@ $(THISDIR)/GNUmakefile : $(BUILDDIR)/index
 # Build the extractor transform for extracting the contents of the archive source file.
 $(BUILDDIR)/extractor.xslt : $(SRC) $(THISDIR)/lib/archive2extractor.xslt
 	$(silent)$(call ensuredirectory,$(dir $@))
-	$(silent)$(XSLTPROC) --nonet --novalid -o $(call quote,$@) $(call quote,$(THISDIR)/lib/archive2extractor.xslt) $(call quote,$<)
+	$(silent)$(XSLTPROC) --nonet --novalid --nomkdir --nowrite $(call quote,$(THISDIR)/lib/archive2extractor.xslt) $(call quote,$<) >|$(call quote,$@)
 
 # Use the extractor transform to extract the archive source file out into its components.
 #
 # This target sleeps for 1 second to ensure the resulting index will always be newer than this make·file.
+#
+# If the archive is empty, the index will not be written by `xsltproc´ and will need to be manually created.
 $(BUILDDIR)/index : $(BUILDDIR)/extractor.xslt $(SRC)
 	$(call inform,$(PRINTF) '%s\n' $(call quote,Extracting components for </$(NAME)>…) >&2)
 	$(silent)$(SLEEP) 1
 	$(silent)$(XSLTPROC) --nonet --novalid -o $(call quote,$@) --writesubtree $(call quote,$(dir $@)) $(call quote,$<) $(call quote,$(SRC))
+	$(silent)if $(TEST) ! -e $(call quote,$@); then $(TOUCH) $(call quote,$@); fi
 
 # All archive components are extracted alongside the index.
 $(foreach file,$(archivefiles),$(BUILDDIR)/extracted/$(file)) : $(BUILDDIR)/index ;
@@ -720,7 +777,93 @@ $(DESTDIR)/% : $(SRC) $(foreach file,$(archivefiles),$(BUILDDIR)/files/$(file))
 	$(call inform,$(PRINTF) '%s\n' $(call quote,Archiving </$(NAME)>…) >&2)
 	$(silent)$(call ensuredirectory,$(dir $@))
 	$(silent)$(RM) -f -R $(call quote,$@)
-	$(silent)$(CD) $(call quote,$(BUILDDIR)/files); if $(call xpath,/*/@*[local-name()="expanded" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"],$(abspath $<)); then $(MKDIR) -p $(call quote,$(abspath $@)); $(PRINTF) '%s\n' $(foreach file,$(archivefiles),$(call quote,$(file))) | $(PAX) -r -w $(call quote,$(abspath $@)); else $(PRINTF) '%s\n' $(foreach file,$(archivefiles),$(call quote,$(file))) | $(PAX) -w -x ustar > $(call quote,$(abspath $@)); fi
+	$(silent)$(call ensuredirectory,$(BUILDDIR)/files)
+	$(silent)$(CD) $(call quote,$(BUILDDIR)/files); if $(call xpath,/*/@*[local-name()="expanded" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"],$(abspath $<)); then $(MKDIR) -p $(call quote,$(abspath $@)); $(PRINTF) '$(if $(archivefiles),%s\n,)' $(foreach file,$(archivefiles),$(call quote,$(file))) | $(PAX) -r -w $(call quote,$(abspath $@)); else $(PRINTF) '$(if $(archivefiles),%s\n,)' $(foreach file,$(archivefiles),$(call quote,$(file))) | $(PAX) -w -x ustar >|$(call quote,$(abspath $@)); fi
+
+# ━ § BEGIN TWO‐STEP MAKE·FILE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+else ifeq ($(MODE),urn:fdc:ladys.computer:20231231:Shu1She4:mode:_2stage)
+
+# ─ ¶ Non‐Recipe Variable Definitions ─────────────────────────────────
+
+override makefile := $(abspath $(THISDIR)/GNUmakefile)
+
+# (overridable) Options to use when calling ⛩📰 书社 the first time.
+shushedataopts := INCLUDEDIR=$(call quote,$(DATADIR)) BUILDDIR=$(call quote,$(BUILDDIR)/stage1) DESTDIR=$(call quote,$(BUILDDIR)/data) FINDRULES=$(call quote,$(FINDRULES) -a '(' $(FINDDATARULES) ')') FINDINCLUDERULES=$(call quote,$(FINDINCLUDERULES)) MODE='urn:fdc:ladys.computer:20231231:Shu1She4:mode:default'
+
+# (overridable) Options to use when calling ⛩📰 书社 the second time.
+shushesiteopts := INCLUDEDIR=$(call quote,$(INCLUDEDIR) $(BUILDDIR)/data) BUILDDIR=$(call quote,$(BUILDDIR)/stage2) FINDRULES=$(call quote,$(FINDRULES) -a '!' '(' $(FINDDATARULES) ')') FINDINCLUDERULES=$(call quote,$(FINDINCLUDERULES)) MODE='urn:fdc:ladys.computer:20231231:Shu1She4:mode:default'
+
+# ─ ¶ Recipe Variable Definitions ─────────────────────────────────────
+
+# ─ ¶ Phony Targets ───────────────────────────────────────────────────
+
+# Compile all files, or error if any are recursive.
+all : data
+	@$(MAKE) -f $(call quote,$(makefile)) $(shushesiteopts)
+
+# Destroy buildfiles.
+clean :
+	$(if $(BUILDDIR),$(silent)$(RM) -f -R $(call quote,$(BUILDDIR)/),)
+
+# Build the data and remove outdated data files.
+data : $(BUILDDIR)/data.out
+	@$(MAKE) -f $(call quote,$(makefile)) install $(shushedataopts)
+	$(silent)$(FIND) $(call quote,$(BUILDDIR)/data) '!' -exec $(GREP) -F -q -x '{}' $(call quote,$<) ';' -a '(' -type d -o -print ')' | $(xargsmultiquote) | $(XARGS) -E '' $(RM)
+
+# Destroy build directory and installed files.
+gone : clean uninstall ;
+
+# Install the compiled files into `DESTDIR´.
+install : all
+	@$(MAKE) -f $(call quote,$(makefile)) $@ $(shushesiteopts)
+	@$(MAKE) -f $(call quote,$(makefile)) $(foreach dest,$(patsubst $(BUILDDIR)/data/%,$(DESTDIR)/%,$(shell $(CAT) $(call quote,$(BUILDDIR)/data.out))),$(call quote,$(dest)))
+
+# List all source files and includes and their computed types.
+list : data
+	@$(PRINTF) '%b' $(call quote,\0033[1;7m||Stage|1:||\0033[22;27m\0033[4m||||||||||||||||||||\0033[24m ) | $(TR) ' |' '\n '
+	@$(MAKE) -f $(call quote,$(makefile)) $@ $(shushedataopts)
+	@$(PRINTF) '%b' $(call quote, \0033[1;7m||Stage|2:||\0033[22;27m\0033[4m||||||||||||||||||||\0033[24m ) | $(TR) ' |' '\n '
+	@$(MAKE) -f $(call quote,$(makefile)) $@ $(shushesiteopts)
+listout : data
+	@{ $(MAKE) -f $(call quote,$(makefile)) $@ $(shushedataopts); $(MAKE) -f $(call quote,$(makefile)) $@ $(shushesiteopts); } | $(SED) '$$!s/$$/ /' | $(TR) -d '\n'
+list1 listout1 : %1 :
+	@$(MAKE) -f $(call quote,$(makefile)) $* $(shushedataopts)
+list2 listout2 : %2 : data
+	@$(MAKE) -f $(call quote,$(makefile)) $* $(shushesiteopts)
+
+# Destroy installed files.
+uninstall :
+	@$(MAKE) -f $(call quote,$(makefile)) $@ $(shushesiteopts)
+
+# Add as a prerequisite to treat the target as tho it were phony.
+FORCE : ;
+
+# ─ ¶ Special Targets ─────────────────────────────────────────────────
+
+# Don’t use any implicit rules.
+.SUFFIXES : ;
+
+# Phony rules; always consider these out·of·date.
+.PHONY : FORCE all data clean gone install list listout uninstall ;
+
+# ─ ¶ Build Targets ───────────────────────────────────────────────────
+
+$(BUILDDIR)/data.out : FORCE
+	@$(MAKE) -f $(call quote,$(makefile)) $(shushedataopts)
+	@$(MAKE) -s -f $(call quote,$(makefile)) listout QUIET=1 $(shushedataopts) | $(TR) ' ' '\n' | $(xargsmultiquote) | $(XARGS) -E '' $(PRINTF) $(call quote,$(BUILDDIR)/data/%s\n) >$(call quote,$(BUILDDIR)/data.out)
+
+$(BUILDDIR)/stage1/% : FORCE
+	@$(MAKE) -f $(call quote,$(makefile)) $@ $(shushedataopts)
+
+$(BUILDDIR)/data/% : FORCE
+	@$(MAKE) -f $(call quote,$(makefile)) $@ $(shushedataopts)
+
+$(BUILDDIR)/stage2/% : data
+	@$(MAKE) -f $(call quote,$(makefile)) $@ $(shushesiteopts)
+
+$(DESTDIR)/% : data
+	$(if $(shell $(GREP) -F -x $(call quote,$(BUILDDIR)/data/$*) $(BUILDDIR)/data.out),$(call inform $(PRINTF) '%s\n' $(call quote,Copying over </$*>…) >&2)$(newline),$(CP) $(call quote,$(BUILDDIR)/data/$*) $(call quote,$@),@$(MAKE) -f $(call quote,$(makefile)) $@ $(shushesiteopts))
 
 # ━ § END DEFINED MAKE·FILE MODES ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━