PHP5 SOAP not adding namespace to parameters

Dear all, we're having a problem with the SOAP extension provided by PHP5. Similar calls using the SOAP component of PEAR work. Tracing the request with a network analyzer this is what PHP5 generates: <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="TCOL_MATRIX"> <SOAP-ENV:Body> <ns1:Addr_Map> <reg></reg> <prov>mi</prov> <com>milano</com> <fraz></fraz> <topo>Cuoco</topo> <civ>7</civ> <gst></gst> </ns1:Addr_Map> </SOAP-ENV:Body> </SOAP-ENV:Envelope> This is what PEAR generates: <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:ns4="TCOL_MATRIX"> <SOAP-ENV:Body> <ns4:Addr_Map> <ns4:reg></ns4:reg> <ns4:prov>mi</ns4:prov> <ns4:com>milano</ns4:com> <ns4:fraz></ns4:fraz> <ns4:topo></ns4:topo> <ns4:civ></ns4:civ> <ns4:gst></ns4:gst> </ns4:Addr_Map> </SOAP-ENV:Body> </SOAP-ENV:Envelope> Why doesn't PHP5 add the "ns4" namespace to the parameters ? Is there a way to force it to ? Thanks Tristan

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