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<p><br clear="all">
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<h1>clear</h1>
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<p>The keyword is used to remove the contents of the incoming queue of the specified communication port.
<ul>
<li>The operation is valid for both message and procedure based ports.</li>
<li>It is possible to clear all defined ports.</li>
<li>If the port queue is already empty then this operation has no action.</li>
</ul>
<p>Related keywords:</p>
<ul>
<li><a href="all.html"><b><font face="Courier New" color="#003258" size="4">all</font></b></a></li>
<li><a href="port.html"><b><font face="Courier New" color="#003258" size="4">port</font></b></a></li>
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<h3 align="center"><i>port_reference</i><font face="Courier New" color="#003258" size="5"><b>.clear;</b></font></h3>
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<ul>
<li>
<p><i> port_reference</i> points out the port to be cleared.</p>
<ul>
<li>
<p>the keywords <b><font face="Courier New" color="#003258" size="4">all port</font> </b> may be used to indicate that all defined ports must be cleared (see the <a href="#Example 2">example
2</a>).</p>
</li>
</ul>
</li>
<li>
<p>The <b><font face="Courier New" color="#003258" size="4">clear</font> </b> keyword introduces port cleansing.</p>
</li>
</ul>
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<p>Example 1:
<p><font face="Courier New">Kapu_PCO.clear;</font>
<p>The port Kapu_PCO will be cleared.</p>
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<p><a name="Example 2">Example 2</a>:
<p><font face="Courier New">all port.clear;</font>
<p>The incoming queues of all defined ports will be emptied.</p>
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<p><a HREF="BNF.html#clearstatement">BNF definition</a> of <font face="Courier New"> clear</font></p>
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