X-Git-Url: https://git.ladys.computer/Etiquette/blobdiff_plain/998a27ffd305bdbef26b0f864924660e575e6e44..6365487166d73a75e1c66b7c8d5683ac46741ed2:/model.js?ds=sidebyside

diff --git a/model.js b/model.js
index 6963a16..48e6813 100644
--- a/model.js
+++ b/model.js
@@ -239,15 +239,19 @@ class Tag {
    * generating the value of `TagSystem::Tag`. It isn’t possible to
    * access this function in its unbound form from outside this module.
    *
+   * ☡ This function throws if the I·R·I is not in the `.iriSpace` of
+   * the `TagSystem` associated with this constructor.
+   *
    * ※ If the I·R·I is not recognized, this function returns `null`.
    */
   static fromIRI(system, storage, iri) {
     const name = `${iri}`;
-    const prefix =
-      `https://${system.authorityName}/tag:${system.taggingEntity}:`;
+    const prefix = `${system.iriSpace}`;
     if (!name.startsWith(prefix)) {
       // The I·R·I does not begin with the expected prefix.
-      return null;
+      throw new RangeError(
+        `I·R·I did not begin with the expected prefix: ${iri}`,
+      );
     } else {
       // The I·R·I begins with the expected prefix.
       const identifier = name.substring(prefix.length);
@@ -298,7 +302,7 @@ class Tag {
     if (!tagName.startsWith(tagPrefix)) {
       // The Tag U·R·I does not begin with the expected prefix.
       throw new RangeError(
-        `Tag U·R·I did not begin with the expected prefix: ${tagName}`,
+        `Tag U·R·I did not begin with the expected prefix: ${tagURI}`,
       );
     } else {
       // The I·R·I begins with the expected prefix.
@@ -973,10 +977,13 @@ class Tag {
 
   /** Returns the I·R·I for this `Tag`. */
   get iri() {
-    const tagURI = this.tagURI;
-    return tagURI == null
-      ? null
-      : `https://${this.authorityName}/${tagURI}`;
+    const { identifier, iriSpace } = this;
+    return identifier == null ? null : `${iriSpace}${identifier}`;
+  }
+
+  /** Returns the I·R·I space for this `Tag`. */
+  get iriSpace() {
+    return this.#system.iriSpace;
   }
 
   /** Returns the kind of this `Tag`. */
@@ -1700,7 +1707,14 @@ export class TagSystem {
 
   /** Returns the I·R·I for this `TagSystem`. */
   get iri() {
-    return `https://${this.authorityName}/${this.tagURI}`;
+    return `${this.iriSpace}${this.identifier}`;
+  }
+
+  /**
+   * Returns the prefix used for I·R·I’s of `Tag`s in this `TagSystem`.
+   */
+  get iriSpace() {
+    return `https://${this.authorityName}/tag:${this.taggingEntity}:`;
   }
 
   /** Returns the Tag U·R·I for this `TagSystem`. */