libxml xpath를 사용할 때 네임스페이스 문제 때문에 질문올립니다~~

밑에는 wsdl 문서의 예구요.
xpath를 이용하여 노드들을 가져와야 하는데 네임스페이스를 반드시 등록을 해야만
값을 얻을 수 있더라고요.

그렇다면 definitions 에 명시된 모든 네임스페이스들을 등록해줘야하는 건가요?
wsdl 문서는 정해져 있는것이 아니고 바뀌는 부분이기 때문에 어떻게 해주어야 하는건지
난감하네요.

처음 wsdl 문서를 읽고나서 definitions 부분의 네임스페이스들을 파싱하는 작업이 필요한건지 알고싶습니다.
아니면 모든 네임스페이스를 지우는 방법이 있는건지도 궁금하네요..ㅜㅠ

<?xml version="1.0" encoding="UTF-8"?>

< definitions name="calc"
targetNamespace="http://websrv.cs.fsu.edu/~engelen/calc.wsdl"
xmlns:tns="http://websrv.cs.fsu.edu/~engelen/calc.wsdl"
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:ns="urn:calc"
xmlns:SOAP="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:MIME="http://schemas.xmlsoap.org/wsdl/mime/"
xmlns:DIME="http://schemas.xmlsoap.org/ws/2002/04/dime/wsdl/"
xmlns:WSDL="http://schemas.xmlsoap.org/wsdl/"
xmlns="http://schemas.xmlsoap.org/wsdl/">

< types>

< schema targetNamespace="urn:calc"
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:ns="urn:calc"
xmlns="http://www.w3.org/2001/XMLSchema"
elementFormDefault="unqualified"
attributeFormDefault="unqualified">
< import namespace="http://schemas.xmlsoap.org/soap/encoding/" schemaLocation="http://schemas.xmlsoap.org/soap/encoding/"/>

< message name="addRequest">
< part name="a" type="xsd:double"/>
< part name="b" type="xsd:double"/>

< message name="addResponse">
< part name="result" type="xsd:double"/>

< message name="subRequest">
< part name="a" type="xsd:double"/>
< part name="b" type="xsd:double"/>

< message name="subResponse">
< part name="result" type="xsd:double"/>

< message name="mulRequest">
< part name="a" type="xsd:double"/>
< part name="b" type="xsd:double"/>

< message name="mulResponse">
< part name="result" type="xsd:double"/>

< message name="divRequest">
< part name="a" type="xsd:double"/>
< part name="b" type="xsd:double"/>

< message name="divResponse">
< part name="result" type="xsd:double"/>

< message name="powRequest">
< part name="a" type="xsd:double"/>
< part name="b" type="xsd:double"/>

< message name="powResponse">
< part name="result" type="xsd:double"/>

< portType name="calcPortType">
< operation name="add">
< documentation>Sums two values
< input message="tns:addRequest"/>
< output message="tns:addResponse"/>

< operation name="sub">
< documentation>Subtracts two values
< input message="tns:subRequest"/>
< output message="tns:subResponse"/>

< operation name="mul">
< documentation>Multiplies two values
< input message="tns:mulRequest"/>
< output message="tns:mulResponse"/>

< operation name="div">
< documentation>Divides two values
< input message="tns:divRequest"/>
< output message="tns:divResponse"/>

< operation name="pow">
< documentation>Raises a to b
< input message="tns:powRequest"/>
< output message="tns:powResponse"/>

< binding name="calc" type="tns:calcPortType">
< SOAP:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/>
< operation name="add">
< SOAP:operation style="rpc" soapAction=""/>
< input>
< SOAP:body use="encoded" namespace="urn:calc" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>

< output>
< SOAP:body use="encoded" namespace="urn:calc" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>


< operation name="sub">
< SOAP:operation style="rpc" soapAction=""/>
< input>
< SOAP:body use="encoded" namespace="urn:calc" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>

< output>
< SOAP:body use="encoded" namespace="urn:calc" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>


< operation name="mul">
< SOAP:operation style="rpc" soapAction=""/>
< input>
< SOAP:body use="encoded" namespace="urn:calc" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>

< output>
< SOAP:body use="encoded" namespace="urn:calc" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>


< operation name="div">
< SOAP:operation style="rpc" soapAction=""/>
< input>
< SOAP:body use="encoded" namespace="urn:calc" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>

< output>
< SOAP:body use="encoded" namespace="urn:calc" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>


< operation name="pow">
< SOAP:operation style="rpc" soapAction=""/>
< input>
< SOAP:body use="encoded" namespace="urn:calc" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>

< output>
< SOAP:body use="encoded" namespace="urn:calc" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>

< service name="calc">
< documentation>Simple calculator service
< port name="calc" binding="tns:calc">
< SOAP:address location="http://websrv.cs.fsu.edu/~engelen/calcserver.cgi"/>