samug

I need create an abstact complexType in php with nusoap to create this type in wsdl: <xsd:complexType abstract="true" name="abstractClass"> <xsd:sequence> <xsd:element minOccurs="0" name="identifier" nillable="true" type="xsd:string"/> </xsd:sequence> </xsd:complexType> I don't know how to put it to be abstract. I'm using this in PHP: $server->wsdl->addComplexType( 'abstractClass', 'complexType', 'struct', 'sequence',