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KDE 4.9 PyKDE API Reference
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<h1>NRLModel Class Reference</h1>
<code>from PyKDE4.soprano import *</code>
<p>
Inherits: <a href="../soprano/Soprano.FilterModel.html">Soprano.FilterModel</a> → <a href="../soprano/Soprano.Model.html">Soprano.Model</a> → QObject<br />
Namespace: <a href="../soprano/Soprano.html">Soprano</a><br />
<h2>Detailed Description</h2>
<p>\class NRLModel nrlmodel.h Soprano/NRLModel
</p>
<p>
Model filter that makes working with NRL data simpler.
</p>
<p>
The NRLModel enforces NRL cardinality rules. That means predicates with a cardinality
of maximum 1 are always udpated while statements that define predicates with a maximum
cardinality bigger than 1 are rejected once the maximum is reached (future versions
might remove an earlier defined statement based on the time the old statements were
added).
</p>
<p>
Thus, at the moment NRLModel is mostly usable for handling properties with a maximum
cardinality of 1.
</p>
<p>
NRLModel also provides automatic query prefix expansion and named graph creation and
removal with automatic metadata graph handling.
</p>
<p>
THE API AND EVEN THE COMPLETE CLASS IS SUBJECT TO CHANGE!
</p>
<p>
<dl class="author" compact><dt><b>Author:</b></dt><dd> Sebastian Trueg <trueg@kde.org> </dd></dl>
</p>
<p>
\sa Vocabulary.NRL
</p>
<table border="0" cellpadding="0" cellspacing="0"><tr><td colspan="2"><br><h2>Methods</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#NRLModel">__init__</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#NRLModel">__init__</a> (self, <a href="../soprano/Soprano.Model.html">Soprano.Model</a> parent)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../soprano/Soprano.Error.html#ErrorCode">Soprano.Error.ErrorCode</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#addNrlStatement">addNrlStatement</a> (self, <a href="../soprano/Soprano.Statement.html">Soprano.Statement</a> s)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">QUrl </td><td class="memItemRight" valign="bottom"><a class="el" href="#createGraph">createGraph</a> (self, QUrl type, QUrl metadataGraph=0)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../soprano/Soprano.QueryResultIterator.html">Soprano.QueryResultIterator</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#executeQuery">executeQuery</a> (self, QString query, <a href="../soprano/Soprano.Query.html#QueryLanguage">Soprano.Query.QueryLanguage</a> language, QString userQueryLanguage=QString())</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="#ignoreContext">ignoreContext</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="#queryPrefixExpansionEnabled">queryPrefixExpansionEnabled</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">{QString:QUrl} </td><td class="memItemRight" valign="bottom"><a class="el" href="#queryPrefixes">queryPrefixes</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../soprano/Soprano.Error.html#ErrorCode">Soprano.Error.ErrorCode</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#removeAllStatements">removeAllStatements</a> (self, <a href="../soprano/Soprano.Statement.html">Soprano.Statement</a> statement)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../soprano/Soprano.Error.html#ErrorCode">Soprano.Error.ErrorCode</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#removeGraph">removeGraph</a> (self, QUrl graph)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#setEnableQueryPrefixExpansion">setEnableQueryPrefixExpansion</a> (self, bool enable)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#setIgnoreContext">setIgnoreContext</a> (self, bool b)</td></tr>
</table>
<hr><h2>Method Documentation</h2><a class="anchor" name="NRLModel"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">__init__</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"></div></div><a class="anchor" name="NRLModel"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">__init__</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../soprano/Soprano.Model.html">Soprano.Model</a> </td>
<td class="paramname"><em>parent</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"></div></div><a class="anchor" name="addNrlStatement"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../soprano/Soprano.Error.html#ErrorCode">Soprano.Error.ErrorCode</a> addNrlStatement</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../soprano/Soprano.Statement.html">Soprano.Statement</a> </td>
<td class="paramname"><em>s</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Add a statement.
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>s</em> </td><td> The statement containing the property to be set.
If the predicate has NRL cardinality restrictions existing
statements will be updated. Otherwise this method has the
same effect as Model.addStatement().
</td></tr>
</table></dl>
<p> Adding a statement that defines a predicate with a maximum
cardinality bigger than 1 which has already been reached
fails with an error.
</p>
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd> Error.ErrorNone on success.
</dd></dl>
</p></div></div><a class="anchor" name="createGraph"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">QUrl createGraph</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">QUrl </td>
<td class="paramname"><em>type</em>, </td>
</tr>
<tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">QUrl </td>
<td class="paramname"><em>metadataGraph=0</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Create a new graph of type <b>type.</b>
</p>
<p>
This will actually create two graphs: the requested one
and its metadata graph which will already contain basic
metadata like creation date.
</p>
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd> The URI of the newly created graph.
</dd></dl> </p>
<p>
<dl class="since" compact><dt><b>Since:</b></dt><dd> 2.3
</dd></dl>
</p></div></div><a class="anchor" name="executeQuery"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../soprano/Soprano.QueryResultIterator.html">Soprano.QueryResultIterator</a> executeQuery</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">QString </td>
<td class="paramname"><em>query</em>, </td>
</tr>
<tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../soprano/Soprano.Query.html#QueryLanguage">Soprano.Query.QueryLanguage</a> </td>
<td class="paramname"><em>language</em>, </td>
</tr>
<tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">QString </td>
<td class="paramname"><em>userQueryLanguage=QString()</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>If queryPrefixExpansionEnabled is <b>true</b> query prefixes will be expanded before sending the
query to the underlying model.
</p>
<p>
<dl class="since" compact><dt><b>Since:</b></dt><dd> 2.4
</dd></dl>
</p></div></div><a class="anchor" name="ignoreContext"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">bool ignoreContext</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p><dl class="return" compact><dt><b>Returns:</b></dt><dd> <b>true</b> if contexts should be ignored when enforcing NRL
rules.
</dd></dl> </p>
<p>
\sa setIgnoreContext()
</p></div></div><a class="anchor" name="queryPrefixExpansionEnabled"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">bool queryPrefixExpansionEnabled</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p><dl class="return" compact><dt><b>Returns:</b></dt><dd> <b>true</b> if query prefix expansion is enabled.
</dd></dl> </p>
<p>
<dl class="since" compact><dt><b>Since:</b></dt><dd> 2.4
</dd></dl>
</p></div></div><a class="anchor" name="queryPrefixes"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">{QString:QUrl} queryPrefixes</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>The prefixes that have been read from the underlying model.
</p>
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd> A list of prefixes mapping to the namespaces read from
the model. This list is empty if queryPrefixExpansion is disabled.
</dd></dl> </p>
<p>
<dl class="since" compact><dt><b>Since:</b></dt><dd> 2.4
</dd></dl>
</p></div></div><a class="anchor" name="removeAllStatements"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../soprano/Soprano.Error.html#ErrorCode">Soprano.Error.ErrorCode</a> removeAllStatements</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../soprano/Soprano.Statement.html">Soprano.Statement</a> </td>
<td class="paramname"><em>statement</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>If the only node defined in <b>statement</b> is the context the graph including its
metadata is removed.
</p>
<p>
\sa removeGraph
</p>
<p>
<dl class="since" compact><dt><b>Since:</b></dt><dd> 2.4
</dd></dl>
</p></div></div><a class="anchor" name="removeGraph"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../soprano/Soprano.Error.html#ErrorCode">Soprano.Error.ErrorCode</a> removeGraph</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">QUrl </td>
<td class="paramname"><em>graph</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Remove a complete graph including its metadata graph
</p>
<p>
This method can be seen as the counterpart to createGraph
</p>
<p>
<dl class="since" compact><dt><b>Since:</b></dt><dd> 2.3
</dd></dl>
</p></div></div><a class="anchor" name="setEnableQueryPrefixExpansion"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> setEnableQueryPrefixExpansion</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"><em>enable</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Enable automatic query prefix expansion based on nao:hasDefaultNamespaceAbbreviation.
This will trigger reading all prefixes stored in the underlying model.
</p>
<p>
By default query prefix expansion is disabled.
</p>
<p>
<dl class="since" compact><dt><b>Since:</b></dt><dd> 2.4
</dd></dl>
</p></div></div><a class="anchor" name="setIgnoreContext"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> setIgnoreContext</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"><em>b</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>When enforcing the NRL cardinality rules NRLModel can either
ignore the context of statements or treat different contexts
as separate sets, each resetting the cardinality.
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>b</em> </td><td> If <b>true</b> (the default) NRLModel does ignore the context
when enforcing rules. If <b>false</b> the NRL rules can be violated
across contexts.
</td></tr>
</table></dl>
<p> By default contexts are ignored.
</p>
<p>
\sa ignoreContext()
</p></div></div>
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