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1 <!--
2 SPDX-FileCopyrightText: 2024 Lady <https://www.ladys.computer/about/#lady>
3 SPDX-License-Identifier: CC0-1.0
4 -->
5 # ⛩️📰 书社
6
7 <b>A make·file for X·M·L.</b>
8
9 <dfn>⛩️📰 书社</dfn> aims to make it easy to generate websites with
10 X·S·L·T and G·N·U Make.
11 It is consequently only a good choice for people who like X·S·L·T and
12 G·N·U Make and wish it were easier to make websites with them.
13
14 It makes things easier by :⁠—
15
16 - Automatically identifying source files and characterizing them by
17 type (X·M·L, text, or asset).
18
19 - Parsing supported text types into X·M·L trees.
20
21 - Enabling easy inclusion of source files within each other.
22
23 It aims to do this with zero dependencies beyond the programs already
24 installed on your computer†.
25
26 † Assuming an operating system with a fairly featureful, and
27 Posix‐compliant, development setup (e·g, macOS).
28 In fact, on Linux you will probably need to install a few programs:
29 `libxml2-utils`, `xsltproc`, `sharutils`, and `pax`.
30
31 ## Nomenclature
32
33 <i lang="cmn-Hans">书社</i> is a Chinese word meaning “publishing
34 house”.
35
36 The first character, <i lang="cmn-Hans">书</i>, is the simplified form
37 of “document”.
38
39 The second character, <i lang="cmn-Hans">社</i>, contemporarily means
40 “association”, but historically referred to the god of the soil and
41 related altars or festivities.
42 In Japanese, it is an alternate spelling for <i lang="ja">やしろ</i>,
43 the word for “Shinto shrine”.
44
45 The name <i lang="cmn-Hans">书社</i> was chosen to play on this pun, as
46 it is intended as a publishing program for webshrines.
47
48 In Ascii environments, ⛩️📰 书社 should be written `Shushe`, following
49 the pinyin transliteration.
50
51 ## Prerequisites
52
53 In most cases, ⛩️📰 书社 aims to require only functionality which is
54 present in all Posix‐compliant operating systems.
55 There are a few exceptions.
56 Details on particular programs are given below; if a program is not
57 listed, it is assumed that any Posix‐compliant implementation will
58 work.
59
60 ### `file`
61
62 This is a Posix utility, but ⛩️📰 书社 currently depends on
63 unspecified behaviour.
64 It requires support for the following additional options :⁠—
65
66 - **`-C`**, when supplied with `-m`, must be useable to compile a
67 `.mgc` magicfile for use with future invocations of `file`.
68
69 - **`--files-from`** must be useable to provide a file that `file`
70 should read file·names from, and `-` must be useable in this
71 context to specify the standard input.
72
73 - **`--mime-type`** must cause `file` to print the internet media type
74 of the file with no charset parameter.
75
76 - **`--separator`** must be useable to set the separator that `file`
77 uses to separate file names from types.
78
79 These options are implemented by the
80 [Fine Free File Command](https://darwinsys.com/file/), which is used
81 by most operating systems.
82
83 ### `git`
84
85 This is not a Posix utility.
86 Usage of `git` is optional, but recommended (and activated by default).
87 To disable it, set `GIT=`.
88
89 ### `make`
90
91 This is a Posix utility, but ⛩️📰 书社 currently depends on
92 unspecified behaviour.
93 ⛩️📰 书社 requires specifically the G·N·U version of `make`, and
94 depends on functionality present in version 3.81 or later.
95 It is not expected to work in previous versions, or with other
96 implementations of Make.
97
98 ### `pax`
99
100 This is a Posix utility, but not included in the Linux Standard Base or
101 installed by default in many distributions.
102 Only `ustar` format support is required.
103
104 ### `uudecode` and `uuencode`
105
106 These are Posix utilities, but not included in the Linux Standard Base
107 or installed by default in many distributions.
108 The G·N·U [Sharutils](https://www.gnu.org/software/sharutils/) package
109 can be installed to access them.
110
111 ### `xmlcatalog` and `xmllint`
112
113 These are not a Posix utilities.
114 They is a part of `libxml2`, but may need to be installed separately
115 (e·g by the name `libxml2-utils`).
116
117 ### `xsltproc`
118
119 This is not a Posix utility.
120 It is a part of `libxslt`, but may need to be installed separately.
121
122 ## Basic Usage
123
124 Place source files in `sources/` and run `make install` to compile
125 the result to `public/`.
126 Compilation involves the following steps :⁠—
127
128 1. ⛩️📰 书社 compiles all of the magic files in `magic/` into a single
129 file, `build/magic.mgc`.
130
131 2. ⛩️📰 书社 processes all of the parsers in `parsers/` and determines
132 the list of supported plaintext types.
133
134 3. ⛩️📰 书社 identifies all of the source files and includes and uses
135 `build/magic.mgc` to classify them by media type.
136
137 4. ⛩️📰 书社 parses all plaintext and X·M·L source files and includes
138 and then builds a dependency tree between them.
139
140 5. ⛩️📰 书社 uses the dependency tree to establish prerequisites for
141 each output file.
142
143 6. ⛩️📰 书社 compiles each output file to `build/result`.
144
145 7. ⛩️📰 书社 copies most output files from `build/result` to
146 `build/public`, but it does some additional processing instead on
147 those which indicate a non‐X·M·L desired final output form.
148
149 8. ⛩️📰 书社 copies the final resulting files to `public`.
150
151 You can use `make list` to list each identified source file or include
152 alongside its computed type and dependencies.
153 As this is a Make‐based program, steps will only be run if the
154 corresponding buildfile or output file is older than its
155 prerequisites.
156
157 ## Name·spaces
158
159 The ⛩️📰 书社 name·space is `urn:fdc:ladys.computer:20231231:Shu1She4`.
160
161 This document uses a few name·space prefixes, with the following
162 meanings :⁠—
163
164 | Prefix | Expansion |
165 | ---------: | :-------------------------------------------- |
166 | `catalog:` | `urn:oasis:names:tc:entity:xmlns:xml:catalog` |
167 | `exsl:` | `http://exslt.org/common` |
168 | `exslstr:` | `http://exslt.org/strings` |
169 | `html:` | `http://www.w3.org/1999/xhtml` |
170 | `svg:` | `http://www.w3.org/2000/svg` |
171 | `xlink:` | `http://www.w3.org/1999/xlink` |
172 | `xslt:` | `http://www.w3.org/1999/XSL/Transform` |
173 | `书社:` | `urn:fdc:ladys.computer:20231231:Shu1She4` |
174
175 ## Setup and Configuration
176
177 ⛩️📰 书社 depends on the following programs to run.
178 In every case, you may supply your own implementation by overriding the
179 corresponding (allcaps) variable (e·g, set `MKDIR` to supply your own
180 `mkdir` implementation).
181
182 - `awk`
183 - `cat`
184 - `cksum`
185 - `cp`
186 - `date`
187 - `file`
188 - `find`
189 - `git` (optional; set `GIT=` to disable)
190 - `grep`
191 - `ln`
192 - `ls`
193 - `mkdir`
194 - `mv`
195 - `od`
196 - `pax` (only when generating archives)
197 - `printf`
198 - `rm`
199 - `sed`
200 - `sleep`
201 - `test`
202 - `touch`
203 - `tr`
204 - `uuencode`
205 - `uudecode`
206 - `xargs`
207 - `xmlcatalog` (provided by `libxml2`)
208 - `xmllint` (provided by `libxml2`)
209 - `xsltproc` (provided by `libxslt`)
210
211 The following additional variables can be used to control the behaviour
212 of ⛩️📰 书社 :⁠—
213
214 - **`SRCDIR`:**
215 The location of the source files (default: `sources`).
216 Multiple source directories can be provided, so long as the same
217 file subpath doesn’t exist in more than one of them.
218
219 - **`INCLUDEDIR`:**
220 The location of source includes (default: `sources/includes`).
221 This can be inside of `SRCDIR`, but needn’t be.
222 Multiple include directories can be provided, so long as the same
223 file subpath doesn’t exist in more than one of them.
224
225 - **`BUILDDIR`:**
226 The location of the (temporary) build directory (default: `build`).
227 `make clean` will delete this, and it is recommended that it not be
228 used for programs aside from ⛩️📰 书社.
229
230 - **`DESTDIR`:**
231 The location of directory to output files to (default: `public`).
232 `make install` will overwrite files in this directory which
233 correspond to those in `SRCDIR`.
234 It *will not* touch other files, including those generated from files
235 in `SRCDIR` which have since been deleted.
236
237 Files are first compiled to `$(BUILDDIR)/public` before they are
238 copied to `DESTDIR`, so this folder is relatively quick and
239 inexpensive to re·create.
240 It’s reasonable to simply delete it before every `make install` to
241 ensure stale content is removed.
242
243 - **`THISDIR`:**
244 The location of the ⛩️📰 书社 `GNUmakefile`.
245 This should be set automatically when calling Make and shouldn’t ever
246 need to be set manually.
247 This variable is used to find the ⛩️📰 书社 `lib/` folder, which is
248 expected to be in the same location.
249
250 - **`MAGIC`:**
251 A white·space‐separated list of magic files to use (default:
252 `$(THISDIR)/magic/*`).
253
254 - **`EXTRAMAGIC`:**
255 The value of this variable is appended to `MAGIC` by default, to
256 enable additional magic files without overriding the existing ones.
257
258 - **`FINDRULES`:**
259 Rules to use with `find` when searching for source files.
260 The default ignores files that start with a period or hyphen‐minus,
261 those which end with a cloparen, and those which contain a hash,
262 buck, percent, asterisk, colon, semi, eroteme, bracket, backslash,
263 or pipe.
264
265 - **`EXTRAFINDRULES`:**
266 The value of this variable is appended to `FINDRULES` by default, to
267 enable additional rules without overriding the existing ones.
268
269 - **`FINDINCLUDERULES`:**
270 Rules to use with `find` when searching for includes (default:
271 `$(FINDRULES)`).
272
273 - **`EXTRAFINDINCLUDERULES`:**
274 The value of this variable is appended to `FINDINCLUDERULES` by
275 default, to enable additional rules without overriding the existing
276 ones.
277
278 - **`PARSERS`:**
279 A white·space‐separated list of parsers to use (default:
280 `$(THISDIR)/parsers/*.xslt`).
281
282 - **`EXTRAPARSERS`:**
283 The value of this variable is appended to `PARSERS` by default, to
284 enable additional parsers without overriding the existing ones.
285
286 - **`TRANSFORMS`:**
287 A white·space‐separated list of transforms to use (default:
288 `$(THISDIR)/transforms/*.xslt`).
289
290 - **`EXTRATRANSFORMS`:**
291 The value of this variable is appended to `TRANSFORMS` by default, to
292 enable additional transforms without overriding the existing ones.
293
294 - **`XMLTYPES`:**
295 A white·space‐separated list of media types or media type suffixes to
296 consider X·M·L (default: `application/xml text/xml +xml`).
297
298 - **`THISREV`:**
299 The current version of ⛩️📰 书社 (default: derived from the current
300 git tag/branch/commit).
301
302 - **`SRCREV`:**
303 The current version of the source files (default: derived from the
304 current git tag/branch/commit).
305
306 - **`QUIET`:**
307 If this variable has a value, informative messages will not be
308 printed (default: empty).
309 Informative messages print to stderr, not stdout, so disabling them
310 usually shouldn’t be necessary.
311 This does not (cannot) disable messages from Make itself, for which
312 the `-s`, `--silent` ∕ `--quiet` Make option is more likely to be
313 useful.
314
315 - **`VERBOSE`:**
316 If this variable has a value, every recipe instruction will be
317 printed when it runs (default: empty).
318 This is helpful for debugging, but typically too noisy for general
319 usage.
320
321 ## Source Files
322
323 Source files may be placed in `SRCDIR` in any manner; the file
324 structure used there will match the output.
325 The type of source files is *not* determined by file extension, but
326 rather by magic number; this means that files **must** begin with
327 something recognizable.
328 Supported magic numbers include :⁠—
329
330 - `<?xml` for `application/xml` files
331 - `#!js` for `text/javascript` files
332 - `@charset "` for `text/css` files
333 - `#!tsv` for `text/tab-separated-values` files
334 - `%%` for `text/record-jar` files (unregistered; see
335 [[draft-phillips-record-jar-01][]])
336
337 Text formats with associated X·S·L·T parsers are wrapped in a H·T·M·L
338 `<script>` element whose `@type` gives its media type, and then
339 passed to the parser to process.
340 Source files whose media type does not have an associated X·S·L·T
341 parser are considered “assets” and will not be transformed.
342
343 **☡ For compatibility with this program, source file·names must not
344 contain Ascii white·space, colons (`:`), semis (`;`), pipes (`|`),
345 bucks (`$`), percents (`%`), hashes (`#`), asterisks (`*`), brackets
346 (`[` or `]`), erotemes (`?`), backslashes (`\`), or control
347 characters, must not begin with a hyphen‐minus (`-`), and must not end
348 with a cloparen (`)`).**
349 The former characters have the potential to conflict with make syntax,
350 a leading hyphen‐minus is confusable for a commandline argument, and a
351 trailing cloparen [activates a bug in G·N·U Make
352 3.81](https://stackoverflow.com/questions/17148468/capturing-filenames-including-parentheses-with-gnu-makes-wildcard-function#comment24825307_17148894).
353
354 ## Parsers
355
356 Parsers are used to convert plaintext files into X·M·L trees, as well
357 as convert plaintext formats which are already included inline in
358 existing source X·M·L documents.
359 ⛩️📰 书社 comes with some parsers; namely :⁠—
360
361 - **`parsers/plain.xslt`:**
362 Wraps `text/plain` contents in a `<html:pre>` element.
363
364 - **`parsers/record-jar.xslt`:**
365 Converts `text/record-jar` contents into a `<html:div>` of
366 `<html:dl>` elements (one for each record).
367
368 - **`parsers/tsv.xslt`:**
369 Converts `text/tab-separated-values` contents into an `<html:table>`
370 element.
371
372 New ⛩️📰 书社 parsers which target plaintext formats should have an
373 `<xslt:template>` element with no `@name` or `@mode` and whose
374 `@match` attribute…
375
376 - Starts with an appropriately‐name·spaced qualified name for a
377 `<html:script>` element.
378
379 - Follows this with the string `[@type=`.
380
381 - Follows this with a quoted string giving a media type supported by
382 the parser.
383 Media type parameters are *not* supported.
384
385 - Follows this with the string `]`.
386
387 For example, the trivial `text/plain` parser is defined as follows :⁠—
388
389 ```xml
390 <?xml version="1.0"?>
391 <transform
392 xmlns="http://www.w3.org/1999/XSL/Transform"
393 xmlns:html="http://www.w3.org/1999/xhtml"
394 xmlns:书社="urn:fdc:ladys.computer:20231231:Shu1She4"
395 version="1.0"
396 >
397 <书社:id>example:text/plain</书社:id>
398 <template match="html:script[@type='text/plain']">
399 <html:pre><value-of select="."/></html:pre>
400 </template>
401 </transform>
402 ```
403
404 ⛩️📰 书社 will scan the provided parsers for this pattern to determine
405 the set of allowed plaintext file types.
406 Multiple such `<xslt:template>` elements may be provided in a single
407 parser, for example if the parser supports multiple media types.
408 Alternatively, you can set the `@书社:supported-media-types` attribute
409 on the root element of the parser to override media type support
410 detection.
411
412 Even when `@书社:supported-media-types` is set, it is a requirement
413 that each parser transform any `<html:script>` elements with a
414 `@type` which matches their registered types into something else.
415 Otherwise the parser will be stuck in an endless loop.
416 The result tree of applying the transform to the `<html:script>`
417 element will be reparsed (in case any new `<html:script>` elements
418 were added in its subtree), and a `@书社:parsed-by` attribute will be
419 added to each toplevel element in the result.
420 The value of this attribute will be the value of the `<书社:id>`
421 toplevel element in the parser.
422
423 It is possible for parsers to support zero plaintext types.
424 This is useful when targeting specific dialects of X·M·L; parsers in
425 this sense operate on the same basic principles as transforms
426 (described below).
427 The major distinction between X·M·L parsers and transforms is where in
428 the process the transformation happens:
429 Parsers are applied *prior* to embedding (and can be used to generate
430 embeds); transforms are applied *after*.
431
432 It is **strongly recommended** that auxillary templates in parsers be
433 name·spaced (by `@name` or `@mode`) whenever possible, to avoid
434 conflicts between parsers.
435
436 ### Attributes added during parsing
437
438 ⛩️📰 书社 will add a few attributes to the output of the parsing step,
439 namely :⁠—
440
441 - A `@书社:cksum` attribute on toplevel result elements, giving the
442 `cksum` checksum of the corresponding source file.
443
444 - For the elements which result from parsing plaintext `<html:script>`
445 elements :⁠—
446
447 - A `@书社:parsed-by` attribute, giving a space‐separated list of
448 parsers which parsed the node.
449 (Generally, this will be a list of one, but it is possible for the
450 result of a parse to be another plaintext node, which may be
451 parsed by a different parser.)
452
453 - A `@书社:media-type` attribute, giving the identified media type of
454 the plaintext node.
455
456 ## Embedding
457
458 Documents can be embedded in other documents using a `<书社:link>`
459 element with `@xlink:show="embed"`.
460 The `@xlink:href`s of these elements should have the format
461 `about:shushe?source=<path>`, where `<path>` provides the path to the
462 file within `SRCDIR`.
463 Includes, which do not generate outputs of their own but may still be
464 freely embedded, instead use the format
465 `about:shushe?include=<path>`, where `<path>` provides the path
466 within `INCLUDEDIR`.
467
468 Embeds are replaced with the parsed contents of a file, unless the file
469 is an asset, in which case an `<html:object>` element is produced
470 instead (with the contents of the asset file provided as a base64
471 `data:` u·r·i).
472 Embed replacements will be given a `@书社:identifier` attribute whose
473 value will match the `@xlink:href` of the embed.
474
475 Embedding takes place after parsing but before transformation, so
476 parsers are able to generate their own embeds.
477 ⛩️📰 书社 is able to detect the transitive embed dependencies of files
478 and update them accordingly; it will signal an error if the
479 dependencies are recursive.
480
481 ## Output Redirection
482
483 By default, ⛩️📰 书社 installs files to the same location in `DESTDIR`
484 as they were placed in their `SRCDIR`.
485 This behaviour can be customized by setting the `@书社:destination`
486 attribute on the root element, whose value can give a different path.
487 This attribute is read after parsing, but before transformation (where
488 it is silently dropped).
489
490 ## Transforms
491
492 Transforms are used to convert X·M·L files into their final output,
493 after all necessary parsing and embedding has taken place.
494 ⛩️📰 书社 comes with some transforms; namely :⁠—
495
496 - **`transforms/asset.xslt`:**
497 Converts `<html:object>` elements which correspond to recognized
498 media types into the appropriate H·T·M·L elements, and deletes
499 `<html:style>` elements from the body of the document and moves
500 them to the head.
501
502 - **`transforms/metadata.xslt`:**
503 Provides basic `<html:head>` metadata.
504 This metadata is generated from `<html:meta>` elements with one of
505 the following `@itemprop` attributes :⁠—
506
507 - **`urn:fdc:ladys.computer:20231231:Shu1She4:title`:**
508 Provides the title of the page.
509
510 ⛩️📰 书社 automatically encapsulates H·T·M·L embeds so that their
511 metadata does not propogate up to the embedding document.
512 To undo this behaviour, remove the `@itemscope` and `@itemtype`
513 attributes from the embed during the transformation phase.
514
515 - **`transforms/serialization.xslt`:**
516 Replaces `<书社:serialize-xml>` elements with the (escaped)
517 serialized X·M·L of their contents.
518 This replacement happens during the application phase, after most
519 other transformations have taken place.
520
521 If a `@with-namespaces` attribute is provided, any name·space nodes
522 on the toplevel serialized elements whose U·R·I’s correspond to the
523 definitions of the provided prefixes, as defined for the
524 `<书社:serialize-xml>` element, will be declared using name·space
525 attributes on the serialized elements.
526 Otherwise, only name·space nodes which _differ_ from the definitions
527 on the `<书社:serialize-xml>` element will be declared.
528 The string `#default` may be used to represent the default
529 name·space.
530 Multiple prefixes may be provided, separated by white·space.
531
532 When it comes to name·spaces used internally by ⛩️📰 书社, the
533 prefix used by ⛩️📰 书社 may be declared _in addition to_ the
534 prefix(es) used in the source document(s).
535 It is not possible to selectively only declare one prefix for a
536 name·space to the exclusion of others.
537
538 `<书社:raw-output>` elements may be used inside of
539 `<书社:serialize-xml>` elements to inject raw output into the
540 serialized X·M·L.
541
542 The following are recommendations on effective creation of
543 transforms :⁠—
544
545 - Make template matchers as specific as possible.
546 It is likely an error if two transforms have templates which match
547 the same element (unless the templates have different priority).
548
549 - Name·space templates (with `@name` or `@mode`) whenever possible.
550
551 - Set `@exclude-result-prefixes` on the root `xslt:transform` element
552 to reduce the number of declared name·spaces in the final result.
553
554 ## Global Params
555
556 The following params are made available globally in parsers and
557 transforms :⁠—
558
559 - **`BUILDTIME`:**
560 The current time.
561
562 - **`CKSUM`:**
563 The checksum of the source file (⅌ `cksum`).
564
565 - **`IDENTIFIER`:**
566 The ⛩️📰 书社 identifier of the source file (a u·r·i beginning with
567 `about:shushe`).
568
569 - **`SRCREV`:**
570 The value of the `SRCREV` variable (if present).
571
572 - **`SRCTIME`:**
573 The time at which the source file was last modified.
574 Due to limitations in Posix, this time will only have minute
575 precision if the file was modified in the last six months, and will
576 only have day precision if the file is older.
577 Users should not expect this value to be particularly stable.
578
579 - **`THISREV`:**
580 The value of the `THISREV` variable (if present).
581
582 The following params are only available in transforms :⁠—
583
584 - **`CATALOG`:**
585 The path of the catalog file (within `BUILDDIR`).
586
587 - **`PATH`:**
588 The path of the output file (within `DESTDIR`).
589
590 ## Output Wrapping
591
592 ⛩️📰 书社 will wrap the final output of the transforms in appropriate
593 `<html:html>` and `<html:body>` elements, so it is not necessary for
594 transforms to do this explicitly.
595 After performing the initial transform, ⛩️📰 书社 will match the root
596 node of the result in the following modes to fill in areas of the
597 wrapper :⁠—
598
599 - **`书社:header`:**
600 The result of matching in this mode is prepended into the
601 `<html:body>` of the output (before the transformation result).
602
603 - **`书社:footer`:**
604 The result of matching in this mode is appended into the
605 `<html:body>` of the output (after the transformation result).
606
607 - **`书社:metadata`:**
608 The result of matching in this mode is inserted into the
609 `<html:head>` of the output.
610
611 In addition to being called with the transform result, each of these
612 modes will additionally be called with a `<xslt:include>` element
613 corresponding to each transform.
614 If a transform has a `<书社:id>` top‐level element whose value is an
615 i·r·i, its `<xslt:include>` element will have a corresponding
616 `@书社:id` attribute.
617 This mechanism can be used to allow transforms to insert content
618 without matching any elements in the result; for example, the
619 following transform adds a link to a stylesheet to the `<html:head>`
620 of every page :⁠—
621
622 ```xml
623 <?xml version="1.0"?>
624 <transform
625 xmlns="http://www.w3.org/1999/XSL/Transform"
626 xmlns:html="http://www.w3.org/1999/xhtml"
627 xmlns:xslt="http://www.w3.org/1999/XSL/Transform"
628 xmlns:书社="urn:fdc:ladys.computer:20231231:Shu1She4"
629 exclude-result-prefixes="书社"
630 version="1.0"
631 >
632 <书社:id>example:add-stylesheet-links.xslt</书社:id>
633 <template match="xslt:include[@书社:id='example:add-stylesheet-links.xslt']" mode="书社:metadata">
634 <html:link rel="stylesheet" type="text/css" href="/style.css"/>
635 </template>
636 </transform>
637 ```
638
639 Output wrapping can be entirely disabled by adding a
640 `@书社:disable-output-wrapping` attribute to the top‐level element in
641 the result tree.
642 It will not be performed on outputs whose root elements are
643 `<书社:archive>`, `<书社:base64-binary>`, or `<书社:raw-text>`
644 (described below).
645
646 ## Applying Attributes
647
648 The `<书社:apply-attributes>` element will apply any attributes on the
649 element to the element(s) it wraps.
650 It is especially useful in combination with embeds.
651
652 The `<书社:apply-attributes-to-root>` element will apply any attributes
653 on the element to the root node of the final transformation result.
654 It is especially useful in combination with output wrapping.
655
656 In both cases, attributes from various sources are combined with
657 white·space between them.
658 Attribute application takes place after all ordinary transforms have
659 completed.
660
661 Both elements ignore attributes in the `xml:` name·space, except for
662 `@xml:lang`, which ignores all but the first definition (including
663 any already present on the root element).
664 On H·T·M·L and S·V·G elements, `@lang` has the same behaviour as
665 `@xml:lang`.
666
667 ## Other Kinds of Output
668
669 There are a few special elements in the `书社:` name·space which, if
670 they appear as the toplevel element in a transformation result, cause
671 ⛩️📰 书社 to produce something other than an X·M·L file.
672 They are :⁠—
673
674 - **`<书社:archive>`:**
675 Each child element with a `@书社:archived-as` attribute will be
676 archived as a separate file in a resulting tarball (this attribute
677 gives the file name).
678 These elements will be processed the same as the root elements of any
679 other file (e·g, they will be wrapped; they can themselves specify
680 non X·M·L output types, ⁊·c).
681 Other child elements will be ignored.
682
683 If the `<书社:archive>` element is given an `@书社:expanded`
684 attribute, rather than producing a tarball ⛩️📰 书社 will output
685 the directory which expanding the tarball would produce.
686 This mechanism can be used to generate multiple files from a single
687 source, provided all of the files are contained with·in the same
688 directory.
689
690 - **`<书社:base64-binary>`:**
691 The text nodes in the transformation result will, after removing all
692 Ascii whitespace, be treated as a Base·64 string, which is then
693 decoded.
694
695 - **`<书社:raw-text>`:**
696 A plaintext (U·T·F‐8) file will be produced from the text nodes in
697 the transformation result.
698
699 ## License
700
701 This repository conforms to [REUSE][].
702
703 Most source files are licensed under the terms of the <cite>Mozilla
704 Public License, version 2.0</cite>.
705
706 [REUSE]: <https://reuse.software/spec/>
707 [draft-phillips-record-jar-01]: <https://datatracker.ietf.org/doc/html/draft-phillips-record-jar-01>
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