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| <h1 class="title">ARQ - Basic Federated SPARQL Query</h1> |
| |
| |
| <main class="d-flex flex-xl-row flex-column"> |
| |
| <aside class="text-muted align-self-start mb-3 p-0 d-xl-none d-block"> |
| <h2 class="h6 sticky-top m-0 p-2 bg-body-tertiary">On this page</h2> |
| <nav id="TableOfContents"> |
| <ul> |
| <li><a href="#syntax">Syntax</a></li> |
| <li><a href="#algebra">Algebra</a></li> |
| <li><a href="#performance-considerations">Performance Considerations</a></li> |
| <li><a href="#controlling-service-requests">Controlling <code>SERVICE</code> requests.</a> |
| <ul> |
| <li> |
| <ul> |
| <li><a href="#arqhttpserviceallowed"><code>arq:httpServiceAllowed</code></a></li> |
| <li><a href="#arqhttpqueryclient"><code>arq:httpQueryClient</code></a></li> |
| <li><a href="#arqhttpservicesendmode"><code>arq:httpServiceSendMode</code></a></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| <li><a href="#old-context-setting">Old Context setting</a> |
| <ul> |
| <li> |
| <ul> |
| <li><a href="#srvquerytimeout"><code>srv:queryTimeout</code></a></li> |
| <li><a href="#srvquerycompression"><code>srv:queryCompression</code></a></li> |
| <li><a href="#srvqueryclient"><code>srv:queryClient</code></a></li> |
| <li><a href="#srvservicecontext"><code>srv:serviceContext</code></a></li> |
| </ul> |
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| <article class="flex-column me-lg-4"> |
| <p>There are already ways to access remote RDF data. The simplest is |
| to read a document which is an RDF graph and query it. Another way |
| is with the |
| <a href="http://www.w3.org/TR/rdf-sparql-protocol/">SPARQL protocol</a> which |
| allows a query to be sent to a remote service endpoint and the |
| results sent back (in RDF, or an |
| <a href="http://www.w3.org/TR/rdf-sparql-XMLres/">XML-based results format</a> |
| or even a <a href="http://www.w3.org/TR/rdf-sparql-json-res/">JSON one</a>).</p> |
| <p><code>SERVICE</code> is a feature of SPARQL 1.1 that allows an executing query |
| to make a SPARQL protocol to another SPARQL endpoint.</p> |
| <h2 id="syntax">Syntax</h2> |
| <div class="highlight"><pre tabindex="0" style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-sparql" data-lang="sparql"><span style="display:flex;"><span><span style="color:#a2f;font-weight:bold">PREFIX</span> : <span style="color:#a0a000"><http://example/></span> |
| </span></span><span style="display:flex;"><span><span style="color:#a2f;font-weight:bold">PREFIX</span> <span style="color:#00f;font-weight:bold">dc</span>: <span style="color:#a0a000"><http://purl.org/dc/elements/1.1/></span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span><span style="color:#a2f;font-weight:bold">SELECT</span> <span style="color:#b8860b">?a</span> |
| </span></span><span style="display:flex;"><span><span style="color:#a2f;font-weight:bold">FROM</span> <span style="color:#a0a000"><mybooks.rdf></span> |
| </span></span><span style="display:flex;"><span>{ |
| </span></span><span style="display:flex;"><span> <span style="color:#b8860b">?b</span> <span style="color:#00f;font-weight:bold">dc</span>:<span style="color:#008000;font-weight:bold">title</span> <span style="color:#b8860b">?title</span> . |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">SERVICE</span> <span style="color:#a0a000"><http://sparql.org/books></span> |
| </span></span><span style="display:flex;"><span> { <span style="color:#b8860b">?s</span> <span style="color:#00f;font-weight:bold">dc</span>:<span style="color:#008000;font-weight:bold">title</span> <span style="color:#b8860b">?title</span> . <span style="color:#b8860b">?s</span> <span style="color:#00f;font-weight:bold">dc</span>:<span style="color:#008000;font-weight:bold">creator</span> <span style="color:#b8860b">?a</span> } |
| </span></span><span style="display:flex;"><span>} |
| </span></span></code></pre></div><h2 id="algebra">Algebra</h2> |
| <p>There is an operator in the algebra.</p> |
| <div class="highlight"><pre tabindex="0" style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-sparql" data-lang="sparql"><span style="display:flex;"><span>(<span style="color:#a2f;font-weight:bold">prefix</span> ((<span style="color:#00f;font-weight:bold">dc</span>: <span style="color:#a0a000"><http://purl.org/dc/elements/1.1/></span>)) |
| </span></span><span style="display:flex;"><span> (<span style="">project</span> (<span style="color:#b8860b">?a</span>) |
| </span></span><span style="display:flex;"><span> (<span style="">jo</span><span style="color:#a2f;font-weight:bold">in</span> |
| </span></span><span style="display:flex;"><span> (<span style="">BGP</span> [<span style="">triple</span> <span style="color:#b8860b">?b</span> <span style="color:#00f;font-weight:bold">dc</span>:<span style="color:#008000;font-weight:bold">title</span> <span style="color:#b8860b">?title</span>]) |
| </span></span><span style="display:flex;"><span> (<span style="color:#a2f;font-weight:bold">service</span> <span style="color:#a0a000"><http://sparql.org/books></span> |
| </span></span><span style="display:flex;"><span> (<span style="">BGP</span> |
| </span></span><span style="display:flex;"><span> [<span style="">triple</span> <span style="color:#b8860b">?s</span> <span style="color:#00f;font-weight:bold">dc</span>:<span style="color:#008000;font-weight:bold">title</span> <span style="color:#b8860b">?title</span>] |
| </span></span><span style="display:flex;"><span> [<span style="">triple</span> <span style="color:#b8860b">?s</span> <span style="color:#00f;font-weight:bold">dc</span>:<span style="color:#008000;font-weight:bold">creator</span> <span style="color:#b8860b">?a</span>] |
| </span></span><span style="display:flex;"><span> )) |
| </span></span><span style="display:flex;"><span> ))) |
| </span></span></code></pre></div><h2 id="performance-considerations">Performance Considerations</h2> |
| <p>This feature is a basic building block to allow remote access in |
| the middle of a query, not a general solution to the issues in |
| distributed query evaluation. The algebra operation is executed |
| without regard to how selective the pattern is. So the order of the |
| query will affect the speed of execution. Because it involves HTTP |
| operations, asking the query in the right order matters a lot. |
| Don’t ask for the whole of a bookstore just to find a book whose |
| title comes from a local RDF file - ask the bookshop a query with |
| the title already bound from earlier in the query.</p> |
| <h2 id="controlling-service-requests">Controlling <code>SERVICE</code> requests.</h2> |
| <p>The <code>SERVICE</code> operation in a SPARQL query may be configured via the Context. |
| The values for configuration can be set in the global context (accessed via |
| <code>ARQ.getContext()</code>) or in the per-query execution context.</p> |
| <p>The prefix <code>arq:</code> is <code><http://jena.apache.org/ARQ#></code>.</p> |
| <table> |
| <thead> |
| <tr> |
| <th>Symbol</th> |
| <th>Java Constant</th> |
| <th>Default</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>arq:httpServiceAllowed</code></td> |
| <td><code>ARQ.httpServiceAllowed</code></td> |
| <td>true</td> |
| </tr> |
| <tr> |
| <td><code>arq:httpQueryClient</code></td> |
| <td><code>ARQ.httpQueryClient</code></td> |
| <td>System default.</td> |
| </tr> |
| <tr> |
| <td><code>arq:httpServiceSendMode</code></td> |
| <td>`ARQ.httpServiceSendMode</td> |
| <td>unset</td> |
| </tr> |
| </tbody> |
| </table> |
| <h4 id="arqhttpserviceallowed"><code>arq:httpServiceAllowed</code></h4> |
| <p>This setting can be used to disable execution of any SERVICE request in query. |
| Set to “false” to prohibit SERVICE requests.</p> |
| <h4 id="arqhttpqueryclient"><code>arq:httpQueryClient</code></h4> |
| <p>The java.net.http HttpClient object to use for SERVICE execution.</p> |
| <h4 id="arqhttpservicesendmode"><code>arq:httpServiceSendMode</code></h4> |
| <p>The HTTP operation to use. The value is a string or a <code>QuerySendMode</code> object.</p> |
| <p>String settings are:</p> |
| <table> |
| <thead> |
| <tr> |
| <th>Setting</th> |
| <th>Effect</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>“POST”</td> |
| <td>Use HTTP POST. Same as “asPost”.</td> |
| </tr> |
| <tr> |
| <td>“GET”</td> |
| <td>Use HTTP GET unconditionally. Same as “asGetAlways”.</td> |
| </tr> |
| <tr> |
| <td>“asGetAlways”</td> |
| <td>Use HTTP GET.</td> |
| </tr> |
| <tr> |
| <td>“asGetWithLimitBody”</td> |
| <td>Use HTTP GET upto a size limit (usually 2kbytes).</td> |
| </tr> |
| <tr> |
| <td>“asGetWithLimitForm”</td> |
| <td>Use HTTP GET upto a size limit (usually 2kbytes), and use a HTML form for the query.</td> |
| </tr> |
| <tr> |
| <td>“asPostForm”</td> |
| <td>Use HTTP POST and use an HTML form for the query.</td> |
| </tr> |
| <tr> |
| <td>“asPost”</td> |
| <td>Use HTTP POST.</td> |
| </tr> |
| </tbody> |
| </table> |
| <h2 id="old-context-setting">Old Context setting</h2> |
| <p>Old settings are honored where possible but should not be used:</p> |
| <p>The prefix <code>srv:</code> is the IRI <code><http://jena.hpl.hp.com/Service#></code>.</p> |
| <table> |
| <thead> |
| <tr> |
| <th>Symbol</th> |
| <th>Usage</th> |
| <th>Default</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>srv:queryTimeout</code></td> |
| <td>Set timeouts</td> |
| <td>none</td> |
| </tr> |
| <tr> |
| <td><code>srv:queryCompression</code></td> |
| <td>Enable use of deflation and GZip</td> |
| <td>true</td> |
| </tr> |
| <tr> |
| <td><code>srv:queryClient</code></td> |
| <td>Enable use of a specific client</td> |
| <td>none</td> |
| </tr> |
| <tr> |
| <td><code>srv:serviceContext</code></td> |
| <td>Per-endpoint configuration</td> |
| <td>none</td> |
| </tr> |
| </tbody> |
| </table> |
| <h4 id="srvquerytimeout"><code>srv:queryTimeout</code></h4> |
| <p>As documented above.</p> |
| <h4 id="srvquerycompression"><code>srv:queryCompression</code></h4> |
| <p>Sets the flag for use of deflation and GZip.</p> |
| <p>Boolean: True indicates that gzip compressed data is acceptable.</p> |
| <h4 id="srvqueryclient"><code>srv:queryClient</code></h4> |
| <p>Enable use of a specific client</p> |
| <p>Provides a slot for a specific <a href="https://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apache/http/client/HttpClient.html">HttpClient</a> for use with a specific <code>SERVICE</code></p> |
| <h4 id="srvservicecontext"><code>srv:serviceContext</code></h4> |
| <p>Provides a mechanism to override system context settings on a per URI basis.</p> |
| <p>The value is a <code>Map<String,Context></code> where the map key is the URI of the service endpoint, and the <code>Context</code> is a set of values to override the default values.</p> |
| <p>If a context is provided for the URI, the system context is copied and the |
| context for the URI is used to set specific values. This ensures that any URI |
| specific settings will be used.</p> |
| |
| </article> |
| |
| <aside class="text-muted align-self-start mb-3 mb-xl-5 p-0 d-none d-xl-flex flex-column sticky-top"> |
| <h2 class="h6 sticky-top m-0 p-2 bg-body-tertiary">On this page</h2> |
| <nav id="TableOfContents"> |
| <ul> |
| <li><a href="#syntax">Syntax</a></li> |
| <li><a href="#algebra">Algebra</a></li> |
| <li><a href="#performance-considerations">Performance Considerations</a></li> |
| <li><a href="#controlling-service-requests">Controlling <code>SERVICE</code> requests.</a> |
| <ul> |
| <li> |
| <ul> |
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