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describing property-based indexing as a variant of data indexing
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‎index.html

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@@ -6055,8 +6055,8 @@ <h3>Using the Document Base for the Default Vocabulary</h3>
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<p>Databases are typically used to make access to
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data more efficient. Developers often extend this sort of functionality into
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their application data to deliver similar performance gains. Often this
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data does not have any meaning from a Linked Data standpoint, but is
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their application data to deliver similar performance gains.
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This data may have no meaning from a Linked Data standpoint, but is
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still useful for an application.</p>
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<p>JSON-LD introduces the notion of <a>index maps</a>
@@ -6441,6 +6441,195 @@ <h3>Using the Document Base for the Default Vocabulary</h3>
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-->
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</pre>
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</aside>
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<section class="informative changed"><h3>Property-based data indexing</h3>
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<p>In its simplest form (as in the examples above),
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data indexing assigns no semantics to the keys of an <a>index map</a>.
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However, in some situations,
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the keys used to index objects are semantically linked to these objects,
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and should be preserved not only syntactically, but also semantically.
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</p>
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<p>If the <a>processing mode</a> is set to <code>json-ld-1.1</code>,
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<code>"@container": "@index"</code> in a term description can be accompanied with
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an <code>"@index"</code> key. The value of that key must map to an <a>IRI</a>,
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which identifies the semantic property linking each object to its key.
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</p>
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<aside class="example ds-selector-tabs"
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title="Property-based data indexing">
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<div class="selectors">
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<button class="selected" data-selects="original">Original</button>
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<button data-selects="expanded">Expanded</button>
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<button data-selects="statements">Statements</button>
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<button data-selects="turtle">Turtle</button>
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<a class="playground" target="_blank"></a>
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</div>
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<pre class="original selected nohighlight" data-transform="updateExample">
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<!--
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{
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"@context": {
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"schema": "http://schema.org/",
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"dc": "http://purl.org/dc/elements/1.1/",
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"name": "schema:name",
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"body": "schema:articleBody",
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"words": "schema:wordCount",
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"post": {
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"@id": "schema:blogPost",
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****"@container": "@index",
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"@index": "dc:language"****
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}
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},
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"@id": "http://example.com/",
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"@type": "schema:Blog",
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"name": "World Financial News",
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"post": {
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"en": {
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"@id": "http://example.com/posts/1/en",
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"body": "World commodities were up today with heavy trading of crude oil...",
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"words": 1539
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},
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"de": {
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"@id": "http://example.com/posts/1/de",
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"body": "Die Werte an Warenbörsen stiegen im Sog eines starken Handels von Rohöl...",
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"words": 1204
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}
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}
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}
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-->
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</pre>
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<pre class="expanded nohighlight"
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data-transform="updateExample"
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data-ignore
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data-result-for="Property-based data indexing-original">
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<!--
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[{
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"@id": "http://example.com/",
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"@type": ["http://schema.org/Blog"],
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"http://schema.org/name": [{"@value": "World Financial News"}],
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"http://schema.org/blogPost": [{
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"@id": "http://example.com/posts/1/en",
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"http://schema.org/articleBody": [
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{"@value": "World commodities were up today with heavy trading of crude oil..."}
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],
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"http://schema.org/wordCount": [
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{"@value": 1539}
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],
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****"http://purl.org/dc/elements/1.1/language": "en"****
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}, {
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"@id": "http://example.com/posts/1/de",
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"http://schema.org/articleBody": [
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{"@value": "Die Werte an Warenbörsen stiegen im Sog eines starken Handels von Rohöl..."}
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],
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"http://schema.org/wordCount": [{"@value": 1204}],
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****"http://purl.org/dc/elements/1.1/language": "de"****
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}]
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}]
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-->
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</pre>
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<table class="statements"
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data-ignore
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data-result-for="Property-based data indexing-expanded"
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data-to-rdf>
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<thead><tr>
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<th>Subject</th>
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<th>Property</th>
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<th>Value</th>
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<th>Value Type</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>http://example.com/</td>
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<td>rdf:type</td>
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<td>schema:Blog</td>
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<td></td>
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</tr>
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<tr>
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<td>http://example.com/</td>
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<td>schema:name</td>
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<td>World Financial News</td>
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<td></td>
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</tr>
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<tr>
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<td>http://example.com/</td>
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<td>schema:blogPost</td>
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<td>http://example.com/posts/1/de</td>
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<td></td>
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</tr>
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<tr>
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<td>http://example.com/</td>
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<td>schema:blogPost</td>
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<td>http://example.com/posts/1/en</td>
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<td></td>
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</tr>
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<tr>
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<td>http://example.com/posts/1/de</td>
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<td>schema:articleBody</td>
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<td>Die Werte an Warenbörsen stiegen im Sog eines starken Handels von Rohöl...</td>
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<td></td>
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</tr>
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<tr>
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<td>http://example.com/posts/1/de</td>
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<td>schema:wordCount</td>
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<td>1204</td>
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<td>xsd:integer</td>
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</tr>
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<tr>
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<td>http://example.com/posts/1/de</td>
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<td>dc:language</td>
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<td>de</td>
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<td></td>
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</tr>
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<tr>
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<td>http://example.com/posts/1/en</td>
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<td>schema:articleBody</td>
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<td>World commodities were up today with heavy trading of crude oil...</td>
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<td></td>
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</tr>
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<tr>
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<td>http://example.com/posts/1/en</td>
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<td>schema:wordCount</td>
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<td>1539</td>
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<td>xsd:integer</td>
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</tr>
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<tr>
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<td>http://example.com/posts/1/en</td>
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<td>dc:language</td>
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<td>en</td>
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<td></td>
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</tr>
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</tbody>
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</table>
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<pre class="turtle nohighlight"
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data-content-type="text/turtle"
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data-ignore
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data-result-for="Property-based data indexing-expanded"
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data-transform="updateExample"
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data-to-rdf>
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<!--
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@prefix schema: <http://schema.org/> .
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@prefix dc: <http://purl.org/dc/elements/1.1/language> .
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@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
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<http://example.com/> a schema:Blog;
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schema:blogPost <http://example.com/posts/1/de>,
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<http://example.com/posts/1/en>;
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schema:name "World Financial News" .
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<http://example.com/posts/1/de>
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schema:articleBody
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"Die Werte an Warenbörsen stiegen im Sog eines starken Handels von Rohöl...";
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schema:wordCount 1204;
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****dc:language "de"****.
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<http://example.com/posts/1/en>
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schema:articleBody
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"World commodities were up today with heavy trading of crude oil...";
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schema:wordCount 1539;
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****dc:language "en"****.
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-->
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</pre>
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</aside>
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</section>
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</section>
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<section class="informative"><h2>Language Indexing</h2>
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