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<div class="chapter">
<div class="titlepage"><div><div><h1 class="title">
<a name="query-langage"></a>Bonobo Activation Query Langage</h1></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="sect1"><a href="query-langage.html#id-1.5.2">The Bonobo Activation query langage</a></span></dt>
<dt><span class="sect1"><a href="query-syntax.html">Syntax</a></span></dt>
<dd><dl>
<dt><span class="sect2"><a href="query-syntax.html#oaf-query-ref-types">Constants</a></span></dt>
<dt><span class="sect2"><a href="query-syntax.html#id-1.5.3.3">Field identifiers</a></span></dt>
<dt><span class="sect2"><a href="query-syntax.html#id-1.5.3.4">Variables</a></span></dt>
<dt><span class="sect2"><a href="query-syntax.html#id-1.5.3.5">Functions</a></span></dt>
<dt><span class="sect2"><a href="query-syntax.html#id-1.5.3.6">Operators</a></span></dt>
</dl></dd>
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<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="id-1.5.2"></a>The Bonobo Activation query langage</h2></div></div></div>
<p>
Bonobo Activation has a query language used to request components with
specific properties from the Bonobo Activation daemon.
The API call <code class="function">bonobo_activation_activate</code> takes a
<span class="emphasis"><em>requirements</em></span> parameter which is
a string containing a specific request in the OAF query
langage.
A simple example is:
</p>
<pre class="programlisting">
CORBA_Object o = bonobo_activation_activate ("repo_ids.has ('IDL:GNOME/Graph/Layout:1.0')",
NULL, 0, NULL, &ev);
</pre>
<p>
This will ask for a component which supports the GNOME/Graph/Lyout:1.0 interface.
You can also do much more complicated things.
</p>
<pre class="programlisting">
"(repo_ids.has_all (['IDL:Bonobo/Control:1.0',
'IDL:Nautilus/ContentView:1.0']) OR
repo_ids.has_one (['IDL:Bonobo/Control:1.0',
'IDL:Bonobo/Embeddable:1.0'])) AND
repo_ids.has('IDL:Bonobo/PersistFile:1.0') AND
foo:bar.defined()"
</pre>
<p>
This would get any component with both 'Control' and 'ContentView' or
with either 'Control' or 'Embeddable' as long as they supported the
'PersistFile' interface, and defined the attribute 'foo:bar'.
</p>
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