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POUsing a WSDL with abstract types in PHP
 

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    <p>I'm working on an integration between our web application and Microsoft Exchange 2007. I am using Exchange Web Services (EWS) to communicate to the Exchange Server. However, I am running into some issues with the WSDL. There are several types defined in the WSDL that have elements of abstract types. For example:</p> <pre><code>&lt;xs:complexType name="RestrictionType"&gt; &lt;xs:sequence&gt; &lt;xs:element ref="t:SearchExpression"/&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; </code></pre> <p>SearchExpression is an abtract type. There are several types that extend SearchExpression such as ExistsType:</p> <pre><code>&lt;xs:complexType name="ExistsType"&gt; &lt;xs:complexContent&gt; &lt;xs:extension base="t:SearchExpressionType"&gt; ... &lt;/xs:extension&gt; &lt;/xs:complexContent&gt; &lt;/xs:complexType&gt; &lt;xs:element name="Exists" type="t:ExistsType" substitutionGroup="t:SearchExpression"/&gt; </code></pre> <p>I would expect to be able to make a valid call that produces the following XML:</p> <pre><code>&lt;Restriction&gt; &lt;Exists&gt; ... &lt;/Exists&gt; &lt;/Restriction&gt; </code></pre> <p>However, when I attempt to make the call using PHP's SoapClient class I receive the following error:</p> <blockquote> <p>The request failed schema validation: The element '<a href="http://schemas.microsoft.com/exchange/services/2006/types:SearchExpression" rel="nofollow noreferrer">http://schemas.microsoft.com/exchange/services/2006/types:SearchExpression</a>' is abstract or its type is abstract. </p> </blockquote> <p>If I modify the definition of the RestrictionType type to the follow, the call works:</p> <pre><code>&lt;xs:element name="Exists" type="t:ExistsType"/&gt; </code></pre> <p>Is PHP's SOAP handling not able to properly handle abstract types in the WSDL, or could there be something wrong with the WSDL itself? The WSDL is stored locally so I can make edits to it if the need arrises.</p> <p>Thank you for your help in advance.</p> <p><strong>Edit:</strong><br> I just wanted to clarify that I am not forming the XML myself. I am using the following code that should be creating the proper XML:</p> <pre><code>$request-&gt;Restriction-&gt;IsGreaterThan-&gt;FieldURI-&gt;FieldURI = 'item:DateTimeReceived'; $request-&gt;Restriction-&gt;IsGreaterThan-&gt;FieldURIOrConstant -&gt;Constant-&gt;Value = date('c', $last_checked_time); </code></pre>
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