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Align descriptions of lang functions. Link to RDF concepts.
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@afs
afs committed Jan 19, 2025
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68 changes: 39 additions & 29 deletions spec/index.html
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Expand Up @@ -6196,11 +6196,13 @@ <h5>STR</h5>
<h5>LANG</h5>
<pre class="prototype nohighlight"> <span class="return">xsd:string</span> <span class="operator">LANG</span> (<span class="type"><span class="type literal">literal</span></span> <span class="name">ltrl</span>)
</pre>
<p>Returns the <span class="type langTag">language tag</span> of <code>ltrl</code>, if it
has one. It returns <code>""</code> if
<code>ltrl</code> has no <span class="type langTag">language tag</span>.
Note that the RDF data model does not include
literals with an empty <span class="type langTag">language tag</span>.</p>
<p>Returns the <a data-cite="RDF12-CONCEPTS#dfn-language-tag">language tag</a>
of `ltrl`, if it has one.
It returns an empty string if `ltrl` has no
<a data-cite="RDF12-CONCEPTS#dfn-language-tag">language tag</a>.
Note that the RDF data model does not include literals with an empty
<a data-cite="RDF12-CONCEPTS#dfn-language-tag">language tag</a>.
</p>
<div class="exampleGroup">
<pre class="data nohighlight">
PREFIX foaf: &lt;http://xmlns.com/foaf/0.1/&gt;
Expand All @@ -6210,8 +6212,7 @@ <h5>LANG</h5>
_:a foaf:mbox &lt;mailto:[email protected]&gt; .
</pre>
<div class="queryGroup">
<p>This query finds the Spanish <code>foaf:name</code> and
<code>foaf:mbox</code>:</p>
<p>This query finds the Spanish `foaf:name` and `foaf:mbox`:</p>
<pre class="query nohighlight">
PREFIX foaf: &lt;http://xmlns.com/foaf/0.1/&gt;
SELECT ?name ?mbox
Expand Down Expand Up @@ -6281,12 +6282,12 @@ <h5>LANGDIR</h5>
<pre class="prototype nohighlight"> <span class="return">xsd:string</span> <span class="operator">LANGDIR</span> (<span class="type"><span class="type literal">literal</span></span> <span class="name">ltrl</span>)
</pre>
<p>
If the argument is a literal with <code>rdf:dirLangString</code>
as its datatype IRI,
the function <code>LANGDIR</code> returns the
<a data-cite="RDF12-CONCEPTS#dfn-base-direction">base direction</a>
of this literal.
Otherwise, the function returns the empty string.
Return the <a data-cite="RDF12-CONCEPTS#dfn-base-direction">base direction</a>
of `ltrl`, if it has one.
It returns an empty string if `ltrl` has no
<a data-cite="RDF12-CONCEPTS#dfn-base-direction">base direction</a>.
Note that the RDF data model does not include literals with an empty
<a data-cite="RDF12-CONCEPTS#dfn-base-direction">base direction</a>.
</p>
<div class="result">
<table>
Expand Down Expand Up @@ -6327,9 +6328,9 @@ <h5>hasLANG</h5>
<pre class="prototype nohighlight"> <span class="return">xsd:string</span> <span class="operator">hasLANG</span> (<span class="type">RDF term</span> <span class="name">term</span>)
</pre>
<p>
The function `hasLANG` returns <code>true</code> if the
argument is a literal with a language
tag. Otherwise, the function returns <code>false</code>.
Return `true` if the RDF Term argument is a literal with a
<a data-cite="RDF12-CONCEPTS#dfn-language-tag">language tag</a>.
Otherwise, the function returns `false`.
</p>
<p>If the argument is a literal, the function is equivalent to
testing for the datatype of the literal being either
Expand Down Expand Up @@ -6373,10 +6374,10 @@ <h5>hasLANG</h5>
<h5>hasLANGDIR</h5>
<pre class="prototype nohighlight"> <span class="return">xsd:string</span> <span class="operator">hasLANGDIR</span> (<span class="type">RDF term</span> <span class="name">term</span>)
</pre>
<p>
The function `hasLANGDIR` returns <code>true</code> if the
argument is a literal with a language tag and a base direction.
Otherwise, the function returns <code>false</code>.
<p>
Return `true` if the RDF Term argument is a literal with a
<a data-cite="RDF12-CONCEPTS#dfn-base-direction">base direction</a>
Otherwise, the function returns `false`.
</p>
<p>If the argument is a literal, the function is equivalent to
testing for the datatype of the literal being
Expand Down Expand Up @@ -6660,7 +6661,7 @@ <h5>STRLANGDIR</h5>
<section id="func-uuid">
<h5>UUID</h5>
<pre class="prototype nohighlight"><span class="return">iri</span> <span class="operator">UUID</span>()</pre>
<p>Return a fresh IRI from the [[[RFC4122]]]. Each call of <code>UUID()</code> returns a
<p>Returns a fresh IRI from the [[[RFC4122]]]. Each call of <code>UUID()</code> returns a
different UUID. It must not be the "nil" UUID (all zeroes). The variant and version of
the UUID is implementation dependent.</p>
<div class="result">
Expand All @@ -6677,7 +6678,7 @@ <h5>UUID</h5>
<section id="func-struuid">
<h5>STRUUID</h5>
<pre class="prototype nohighlight"><span class="return">xsd:string</span> <span class="operator">STRUUID</span>()</pre>
<p>Return a string that is the scheme-specific part of UUID. That is, as a literal with datatype <code>xsd:string</code>,
<p>Returns a string that is the scheme-specific part of UUID. That is, as a literal with datatype <code>xsd:string</code>,
the result of generating a UUID, converting to a literal with datatype <code>xsd:string</code> and removing the
initial <code>urn:uuid:</code>.</p>
<div class="result">
Expand Down Expand Up @@ -7275,11 +7276,15 @@ <h5>CONCAT</h5>
<h5>langMATCHES</h5>
<pre class="prototype nohighlight"> <span class="return">xsd:boolean</span> <span class="operator">langMatches</span> (<span class="type"><span class="type">xsd:string</span></span> <span class="name">language-tag</span>, <span class="type"><span class="type">xsd:string</span></span> <span class="name">language-range</span>)
</pre>
<p>Returns <code>true</code> if <code>language-tag</code> (first argument) matches
<code>language-range</code> (second argument) per the basic filtering scheme defined in

<p>Returns `true` if the <a data-cite="RDF12-CONCEPTS#dfn-language-tag">language tag</a>
(first argument) matches <code>language-range</code> (second argument).
Otherwise, the function returns `false`.
MAtchign is performed according to the the basic filtering scheme defined in
[[RFC4647]] section 3.3.1. <code>language-range</code> is a basic language range per
[[[RFC4647]]] [[RFC4647]] section 2.1. A <code>language-range</code> of "*" matches any
non-empty <code>language-tag</code> string.</p>
non-empty <code>language-tag</code> string. Otherwise, the function returns `false`.
</p>
<div class="exampleGroup">
<pre class="data nohighlight">
PREFIX dc: &lt;http://purl.org/dc/elements/1.1/&gt;
Expand Down Expand Up @@ -12184,14 +12189,19 @@ <h2>Changes between SPARQL 1.1 Query Language and SPARQL 1.2 Query Language</h2>
<li>
Normative changes:
<ul>
<li>Remove concepts of plain and simple literals, in favor of explicit mentions of xsd:string</li>
<li>Remove concepts of plain and simple literals, in favor of explicit mentions of `xsd:string`</li>
<li>Update grammar for triple terms, reifiers, reified triples, annotation syntax, and triple term functions
in <a href="#sparqlGrammar" class="sectionRef"></a></li>
<li>Update grammar for literal base direction syntax and functions in <a href="#sparqlGrammar" class="sectionRef"></a></li>
<li>Update grammar for literal <a data-cite="RDF12-CONCEPTS#dfn-base-direction">base direction</a> syntax</li>
<li>Migrate XML Schema references to 1.1</li>
<li>Update references to XPath from 2.0 to 3.1</li>
<li>Add functions on triple terms to <a href="#func-triple-terms" class="sectionRef"></a></li>
<li>Add functions related to base direction and language tag `LANGDIR`, `hasLANG`, hasLANGDIR, `STRLANGDIR`</li>
<li>Add functions on triple terms to
<a href="#func-triple-terms" class="sectionRef"></a>:
`TRIPLE`, `isTRIPLE`, `SUBJECT`, `PREDICATE`, `OBJECT`.</li>
<li>Add functions related to
<a data-cite="RDF12-CONCEPTS#dfn-language-tag">language tag</a> and
<a data-cite="RDF12-CONCEPTS#dfn-base-direction">base direction</a>:
`LANGDIR`, `hasLANG`, hasLANGDIR, and `STRLANGDIR`</li>
</ul>
</li>
<li>
Expand Down

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