LibXML xmlReadFile如何解析SOAP数据包？

我用LibXML中的xmlReadFile的发放读取一个从微软分析服务上返回的XML文件（里头包括Schema和数据），发现xmlReadFile建立的XMLNode树中，找不到Schema部分。在.net System.XML下，Schema部分和数据部分都在节点树中。

我的问题是LibXMl下怎么处理，才能让节点树包括所有的节点（包括schema和数据）？

下面是XML文件和LibXMl代码：
<?xml version="1.0"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
  <SOAP-ENV:Body>
  <m:DiscoverResponse xmlns:m="urn:schemas-microsoft-com:xml-analysis">
  <m:return xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <root xmlns="urn:schemas-microsoft-com:xml-analysis:rowset" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:EX="urn:schemas-microsoft-com:xml-analysis:exception">
  <xsd:schema xmlns="urn:schemas-microsoft-com:xml-analysis:rowset" targetNamespace="urn:schemas-microsoft-com:xml-analysis:rowset" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sql="urn:schemas-microsoft-com:xml-sql" elementFormDefault="qualified">
  <xsd:element name="root">
  <xsd:complexType>
  <xsd:sequence>
  <xsd:element name="row" type="row" minOccurs="0" maxOccurs="unbounded"/>
  </xsd:sequence>
  </xsd:complexType>
  </xsd:element>
  <xsd:simpleType name="uuid">
  <xsd:restriction base="xsd:string">
  <xsd:pattern value="[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}"/>
  </xsd:restriction>
  </xsd:simpleType>
  <xsd:complexType name="row">
  <xsd:sequence>
  <xsd:element name="DataSourceName" type="xsd:string" sql:field="DataSourceName" minOccurs="0"/>
  <xsd:element name="DataSourceDescription" type="xsd:string" sql:field="DataSourceDescription" minOccurs="0"/>
  <xsd:element name="URL" type="xsd:string" sql:field="URL" minOccurs="0"/>
  <xsd:element name="DataSourceInfo" type="xsd:string" sql:field="DataSourceInfo" minOccurs="0"/>
  <xsd:element name="ProviderName" type="xsd:string" sql:field="ProviderName" minOccurs="0"/>
  <xsd:element name="ProviderType" type="xsd:string" sql:field="ProviderType" minOccurs="0" maxOccurs="unbounded"/>
  <xsd:element name="AuthenticationMode" type="xsd:string" sql:field="AuthenticationMode" minOccurs="0"/>
  </xsd:sequence>
  </xsd:complexType>
  </xsd:schema>
  <row>
  <DataSourceName>Local Analysis Server</DataSourceName>
  <DataSourceDescription>Microsoft Analysis Server 2000 on local machine</DataSourceDescription>
  <URL>http://localhost/xmla/msxisapi.dll</URL>
  <DataSourceInfo>Local Analysis Server</DataSourceInfo>
  <ProviderName>Microsoft XML for Analysis</ProviderName>
  <ProviderType>TDP</ProviderType>
  <ProviderType>MDP</ProviderType>
  <ProviderType>DMP</ProviderType>
  <AuthenticationMode>Unauthenticated</AuthenticationMode>
  </row>
  </root>
  </m:return>
  </m:DiscoverResponse>
  </SOAP-ENV:Body>
</SOAP-ENV:Envelope>


代码：
doc = xmlReadFile("out.xml", NULL, 0);

已解决。