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<td >Qt 5.12</td><td ><a href="qtscxml-index.html">Qt SCXML</a></td><td >SCXML Compliance</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtscxml-index.html">Qt 5.12.6 Reference Documentation</a></td>
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<li class="level1"><a href="#supported-data-models">Supported Data Models</a></li>
<li class="level1"><a href="#supported-elements-and-attributes">Supported Elements and Attributes</a></li>
<li class="level1"><a href="#qt-scxml-extensions">Qt SCXML Extensions</a></li>
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<h1 class="title">SCXML Compliance</h1>
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<h2 id="supported-data-models">Supported Data Models</h2>
<p>Qt SCXML supports the following data models:</p>
<ul>
<li>null data model, as described in <a href="https://www.w3.org/TR/scxml/#minimal-profile">SCXML Specification - B.1 The Null Data Model</a></li>
<li>ECMAScript data model, as described in <a href="https://www.w3.org/TR/scxml/#ecma-profile">SCXML Specification - B.2 The ECMAScript Data Model</a></li>
<li>C++ data model, as described in the <a href="qscxmlcppdatamodel.html">QScxmlCppDataModel</a> documentation</li>
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<h2 id="supported-elements-and-attributes">Supported Elements and Attributes</h2>
<p>The Qt SCXML implementation is SCXML compliant, with a few exceptions:</p>
<ul>
<li>Event data (<code>_event.data</code>) is implemented as a QVariant. If parameters are passed to <code><send></code>, the QVariant holds a QVariantMap, so multiple parameters with the same name are not supported.</li>
<li>There is no "raw" representation of an event.</li>
<li>The (optional) basic http event I/O processor is not supported.</li>
<li>The contents of a <code><script></code> tag and a <code><data></code> tag must be valid for the chosen data model. So, as an example: XML content inside <data> is not supported. However, the ECMAScript data model does support data in JSON format.</li>
<li>The only service that can be instantiated with <code><invoke></code> is another SCXML state machine.</li>
<li>To keep the behavior of dynamically created state machines and compiled state machines the same, the <i>typeexpr</i> and <i>srcexpr</i> attributes are not supported. Moreover, if a <code><content></code> tag is used inside an <code><invoke></code> tag, that content must be XML. Specifically, dynamically creating SCXML, for example by concatenating strings with the ECMAScript data model, is not supported.</li>
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<h2 id="qt-scxml-extensions">Qt SCXML Extensions</h2>
<p>The Qt SCXML implementation extends SCXML in the following ways:</p>
<ul>
<li>If the event is an error event, <code>_event.errorMessage</code> will contain a more detailed description of the error.</li>
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