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Posted to commits@jena.apache.org by bu...@apache.org on 2018/05/05 07:43:07 UTC
svn commit: r1029444 - in /websites/staging/jena/trunk/content: ./
documentation/query/generate-json-from-sparql.html
documentation/query/index.html
Author: buildbot
Date: Sat May 5 07:43:07 2018
New Revision: 1029444
Log:
Staging update by buildbot for jena
Added:
websites/staging/jena/trunk/content/documentation/query/generate-json-from-sparql.html
Modified:
websites/staging/jena/trunk/content/ (props changed)
websites/staging/jena/trunk/content/documentation/query/index.html
Propchange: websites/staging/jena/trunk/content/
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--- websites/staging/jena/trunk/content/documentation/query/generate-json-from-sparql.html (added)
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+ <h1 class="title">ARQ - Generate JSON from SPARQL</h1>
+ <style type="text/css">
+/* The following code is added by mdx_elementid.py
+ It was originally lifted from http://subversion.apache.org/style/site.css */
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+<p>The current W3C recommendation of
+<a href="http://www.w3.org/TR/sparql11-query/">SPARQL 1.1</a> supports the <a href="https://www.w3.org/TR/2013/REC-sparql11-results-json-20130321/">query results in
+JSON format</a>. What is
+described in this page is not that format, but an extension of Apache Jena, which allows
+users to define how results should be returned in a key/value pair fashion, providing
+this way a simpler output. This output can be easily used as model for web applications,
+or inspecting data.</p>
+<p>Compare the output of this extension:</p>
+<div class="codehilite"><pre><span class="p">[</span>
+ <span class="p">{</span>
+ "<span class="n">book</span>"<span class="p">:</span> "<span class="n">http</span><span class="p">:</span><span class="o">//</span><span class="n">example</span><span class="p">.</span><span class="n">org</span><span class="o">/</span><span class="n">book</span><span class="o">/</span><span class="n">book6</span>"<span class="p">,</span>
+ "<span class="n">title</span>"<span class="p">:</span> "<span class="n">Harry</span> <span class="n">Potter</span> <span class="n">and</span> <span class="n">the</span> <span class="n">Half</span><span class="o">-</span><span class="n">Blood</span> <span class="n">Prince</span>"
+ <span class="p">},</span>
+ <span class="p">{</span>
+ "<span class="n">book</span>"<span class="p">:</span> "<span class="n">http</span><span class="p">:</span><span class="o">//</span><span class="n">example</span><span class="p">.</span><span class="n">org</span><span class="o">/</span><span class="n">book</span><span class="o">/</span><span class="n">book7</span>"<span class="p">,</span>
+ "<span class="n">title</span>"<span class="p">:</span> "<span class="n">Harry</span> <span class="n">Potter</span> <span class="n">and</span> <span class="n">the</span> <span class="n">Deathly</span> <span class="n">Hallows</span>"
+ <span class="p">},</span>
+<span class="p">]</span>
+</pre></div>
+
+
+<p>With the output of the SPARQL 1.1 query result JSON format below:</p>
+<div class="codehilite"><pre><span class="p">{</span>
+ "<span class="n">head</span>"<span class="p">:</span> <span class="p">{</span> "<span class="n">vars</span>"<span class="p">:</span> <span class="p">[</span> "<span class="n">book</span>" <span class="p">,</span> "<span class="n">title</span>" <span class="p">]</span>
+ <span class="p">}</span> <span class="p">,</span>
+ "<span class="n">results</span>"<span class="p">:</span> <span class="p">{</span>
+ "<span class="n">bindings</span>"<span class="p">:</span> <span class="p">[</span>
+ <span class="p">{</span>
+ "<span class="n">book</span>"<span class="p">:</span> <span class="p">{</span> "<span class="n">type</span>"<span class="p">:</span> "<span class="n">uri</span>" <span class="p">,</span> "<span class="n">value</span>"<span class="p">:</span> "<span class="n">http</span><span class="p">:</span><span class="o">//</span><span class="n">example</span><span class="p">.</span><span class="n">org</span><span class="o">/</span><span class="n">book</span><span class="o">/</span><span class="n">book6</span>" <span class="p">}</span> <span class="p">,</span>
+ "<span class="n">title</span>"<span class="p">:</span> <span class="p">{</span> "<span class="n">type</span>"<span class="p">:</span> "<span class="n">literal</span>" <span class="p">,</span> "<span class="n">value</span>"<span class="p">:</span> "<span class="n">Harry</span> <span class="n">Potter</span> <span class="n">and</span> <span class="n">the</span> <span class="n">Half</span><span class="o">-</span><span class="n">Blood</span> <span class="n">Prince</span>" <span class="p">}</span>
+ <span class="p">}</span> <span class="p">,</span>
+ <span class="p">{</span>
+ "<span class="n">book</span>"<span class="p">:</span> <span class="p">{</span> "<span class="n">type</span>"<span class="p">:</span> "<span class="n">uri</span>" <span class="p">,</span> "<span class="n">value</span>"<span class="p">:</span> "<span class="n">http</span><span class="p">:</span><span class="o">//</span><span class="n">example</span><span class="p">.</span><span class="n">org</span><span class="o">/</span><span class="n">book</span><span class="o">/</span><span class="n">book7</span>" <span class="p">}</span> <span class="p">,</span>
+ "<span class="n">title</span>"<span class="p">:</span> <span class="p">{</span> "<span class="n">type</span>"<span class="p">:</span> "<span class="n">literal</span>" <span class="p">,</span> "<span class="n">value</span>"<span class="p">:</span> "<span class="n">Harry</span> <span class="n">Potter</span> <span class="n">and</span> <span class="n">the</span> <span class="n">Deathly</span> <span class="n">Hallows</span>" <span class="p">}</span>
+ <span class="p">}</span>
+ <span class="p">]</span>
+ <span class="p">}</span>
+<span class="p">}</span>
+</pre></div>
+
+
+<p>This feature was added in Jena 3.8.0.</p>
+<h2 id="query-syntax">Query Syntax<a class="headerlink" href="#query-syntax" title="Permanent link">¶</a></h2>
+<p>The <code>JSON</code> syntax is similar in certain ways to the SPARQL <code>CONSTRUCT</code> syntax.</p>
+<div class="codehilite"><pre><span class="n">PREFIX</span> <span class="n">purl</span><span class="p">:</span> <span class="o"><</span><span class="n">http</span><span class="p">:</span><span class="o">//</span><span class="n">purl</span><span class="p">.</span><span class="n">org</span><span class="o">/</span><span class="n">dc</span><span class="o">/</span><span class="n">elements</span><span class="o">/</span>1<span class="p">.</span>1<span class="o">/></span>
+<span class="n">PREFIX</span> <span class="n">w3</span><span class="p">:</span> <span class="o"><</span><span class="n">http</span><span class="p">:</span><span class="o">//</span><span class="n">www</span><span class="p">.</span><span class="n">w3</span><span class="p">.</span><span class="n">org</span><span class="o">/</span>2001<span class="o">/</span><span class="n">vcard</span><span class="o">-</span><span class="n">rdf</span><span class="o">/</span>3<span class="p">.</span>0#<span class="o">></span>
+<span class="n">PREFIX</span> <span class="p">:</span> <span class="o"><</span><span class="n">http</span><span class="p">:</span><span class="o">//</span><span class="n">example</span><span class="p">.</span><span class="n">org</span><span class="o">/</span><span class="n">book</span><span class="o">/></span>
+
+<span class="n">JSON</span> <span class="p">{</span>
+ "<span class="n">author</span>"<span class="p">:</span> ?<span class="n">author</span><span class="p">,</span>
+ "<span class="n">title</span>"<span class="p">:</span> ?<span class="n">title</span>
+<span class="p">}</span>
+<span class="n">WHERE</span>
+<span class="p">{</span>
+ ?<span class="n">book</span> <span class="n">purl</span><span class="p">:</span><span class="n">creator</span> ?<span class="n">author</span> <span class="p">.</span>
+ ?<span class="n">book</span> <span class="n">purl</span><span class="p">:</span><span class="n">title</span> ?<span class="n">title</span> <span class="p">.</span>
+ <span class="n">FILTER</span> <span class="p">(</span>?<span class="n">author</span> <span class="p">=</span> <span class="s">'J.K. Rowling'</span><span class="p">)</span>
+<span class="p">}</span>
+</pre></div>
+
+
+<p>As in <code>CONSTRUCT</code>, users are able to specify how the output must look like, using a simple
+key/value pair pattern, which could produce the following output for the query above.</p>
+<div class="codehilite"><pre><span class="p">[</span>
+ <span class="p">{</span>
+ "<span class="n">author</span>" <span class="p">:</span> "<span class="n">J</span><span class="p">.</span><span class="n">K</span><span class="p">.</span> <span class="n">Rowling</span>" <span class="p">,</span>
+ "<span class="n">title</span>" <span class="p">:</span> "<span class="n">Harry</span> <span class="n">Potter</span> <span class="n">and</span> <span class="n">the</span> <span class="n">Deathly</span> <span class="n">Hallows</span>"
+ <span class="p">}</span>
+ <span class="p">{</span>
+ "<span class="n">author</span>" <span class="p">:</span> "<span class="n">J</span><span class="p">.</span><span class="n">K</span><span class="p">.</span> <span class="n">Rowling</span>" <span class="p">,</span>
+ "<span class="n">title</span>" <span class="p">:</span> "<span class="n">Harry</span> <span class="n">Potter</span> <span class="n">and</span> <span class="n">the</span> <span class="n">Philosopher</span><span class="o">'</span><span class="n">s</span> <span class="n">Stone</span>"
+ <span class="p">}</span>
+ <span class="p">{</span>
+ "<span class="n">author</span>" <span class="p">:</span> "<span class="n">J</span><span class="p">.</span><span class="n">K</span><span class="p">.</span> <span class="n">Rowling</span>" <span class="p">,</span>
+ "<span class="n">title</span>" <span class="p">:</span> "<span class="n">Harry</span> <span class="n">Potter</span> <span class="n">and</span> <span class="n">the</span> <span class="n">Order</span> <span class="n">of</span> <span class="n">the</span> <span class="n">Phoenix</span>"
+ <span class="p">}</span>
+ <span class="p">{</span>
+ "<span class="n">author</span>" <span class="p">:</span> "<span class="n">J</span><span class="p">.</span><span class="n">K</span><span class="p">.</span> <span class="n">Rowling</span>" <span class="p">,</span>
+ "<span class="n">title</span>" <span class="p">:</span> "<span class="n">Harry</span> <span class="n">Potter</span> <span class="n">and</span> <span class="n">the</span> <span class="n">Half</span><span class="o">-</span><span class="n">Blood</span> <span class="n">Prince</span>"
+ <span class="p">}</span>
+<span class="p">]</span>
+</pre></div>
+
+
+<h3 id="grammar">Grammar<a class="headerlink" href="#grammar" title="Permanent link">¶</a></h3>
+<p>The normative definition of the syntax grammar of the query string is defined in this table:</p>
+<table class="table">
+<thead>
+<tr>
+<th>Rule</th>
+<th></th>
+<th>Expression</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>JsonQuery</td>
+<td>::=</td>
+<td>JsonClause ( DatasetClause )* WhereClause SolutionModifier</td>
+</tr>
+<tr>
+<td>JsonClause</td>
+<td>::=</td>
+<td>'JSON' '{' JsonObjectMember ( ',' JsonObjectMember )* '}'</td>
+</tr>
+<tr>
+<td>JsonObjectMember</td>
+<td>::=</td>
+<td>String ':' ( Var</td>
+</tr>
+</tbody>
+</table>
+<p><code>DatasetClause</code>, <code>WhereClause</code>, <code>SolutionModifier</code>, <code>String</code>, <code>Var</code>, 'RDFLiteral',
+<code>NumericLiteral</code>, and 'BooleanLiteral' are as for the <a href="http://www.w3.org/TR/sparql11-query/#grammar">SPARQL 1.1 Grammar</a></p>
+<h2 id="programming-api">Programming API<a class="headerlink" href="#programming-api" title="Permanent link">¶</a></h2>
+<p>ARQ provides 2 additional methods in <a href="http://jena.apache.org/documentation/javadoc/arq/org/apache/jena/query/QueryExecution.html">QueryExecution</a> for JSON.</p>
+<div class="codehilite"><pre><span class="n">Iterator</span><span class="o"><</span><span class="n">JsonObject</span><span class="o">></span> <span class="n">QueryExecution</span><span class="p">.</span><span class="n">execJsonItems</span><span class="p">()</span>
+<span class="n">JsonArray</span> <span class="n">QueryExecution</span><span class="p">.</span><span class="n">execJson</span><span class="p">()</span>
+</pre></div>
+
+
+<p>In order to use these methods, it's required to switch on the query syntax
+of ARQ beforehand, when creating the <code>Query</code> object:</p>
+<div class="codehilite"><pre><span class="n">Query</span> <span class="n">query</span> <span class="p">=</span> <span class="n">QueryFactory</span><span class="p">.</span><span class="n">create</span><span class="p">(</span><span class="n">queryString</span><span class="p">,</span> <span class="n">Syntax</span><span class="p">.</span><span class="n">syntaxARQ</span><span class="p">)</span>
+<span class="n">String</span> <span class="n">queryString</span> <span class="p">=</span> "<span class="n">JSON</span> <span class="p">{</span> <span class="s">'name'</span> <span class="p">:</span> ?<span class="n">name</span><span class="p">,</span> <span class="s">'age'</span> <span class="p">:</span> ?<span class="n">age</span> <span class="p">}</span> <span class="n">WHERE</span> <span class="p">...</span> "
+<span class="p">...</span>
+<span class="n">Iterator</span><span class="o"><</span><span class="n">JsonObject</span><span class="o">></span> <span class="n">json</span> <span class="p">=</span> <span class="n">qexec</span><span class="p">.</span><span class="n">execJsonItems</span><span class="p">()</span>
+</pre></div>
+
+
+<h2 id="fuseki-support">Fuseki Support<a class="headerlink" href="#fuseki-support" title="Permanent link">¶</a></h2>
+<p>JSON queries work correctly in the Fuseki web interface, but at the moment the support for
+remote calls has not been implemented. The web interface editor parses the SPARQL implementation
+syntax, so syntax errors are expected at this moment when using the 'JSON' clause.</p>
+<p><a href="index.html">ARQ documentation index</a></p>
+ </div>
+</div>
+
+</div><!--/.container -->
+
+ <footer class="footer">
+ <div class="container">
+ <p>Copyright © 2011–2018 The Apache Software Foundation, Licensed under
+ the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.
+ </p>
+ <p>
+ Apache Jena, Jena, the Apache Jena project logo,
+ Apache and the Apache feather logos are trademarks of The Apache Software Foundation.
+ </p>
+ </div>
+ </footer>
+
+ <!-- for marking links as active in the navbar-menu -->
+ <script type="text/javascript">
+ var link = $('a[href="' + this.location.pathname + '"]');
+ if (link != undefined)
+ link.parents('li,ul').addClass('active');
+ </script>
+
+</body>
+</html>
Modified: websites/staging/jena/trunk/content/documentation/query/index.html
==============================================================================
--- websites/staging/jena/trunk/content/documentation/query/index.html (original)
+++ websites/staging/jena/trunk/content/documentation/query/index.html Sat May 5 07:43:07 2018
@@ -236,6 +236,7 @@ parsed with an explicit declaration of <
<li><a href="assignment.html">LET variable assignment</a></li>
<li><a href="collation.html">Order results using a Collation</a></li>
<li><a href="construct-quad.html">Construct Quad</a></li>
+<li><a href="generate-json-from-sparql.html">Generate JSON from SPARQL</a></li>
</ul>
<h2 id="update">Update<a class="headerlink" href="#update" title="Permanent link">¶</a></h2>
<p>ARQ supports the W3C standard SPARQL Update language.</p>