中文XML论坛--一个Schema错误，高手进来看看

贴子主题：一个Schema错误，高手进来看看

本主题类别:

下面这个文档用xmlspy打开时，总是提示如下错误，是怎么回事？
the element"xs:import"is unexpected at this location（错误所指位置，大概在14行，已经用红色标出。）

<?xml version="1.0" encoding="UTF-8"?>
<schema
    targetNamespace="urn:oasis:xacml:2.0:saml:assertion:schema:os"
    xmlns="http://www.w3.org/2001/XMLSchema"
    xmlns:xs="http://www.23.org/2001/XMLSchema"
    xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
    xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
    xmlns:xacml-context="urn:oasis:names:tc:xacml:2.0:context:schema:os"
    xmlns:xacml="urn:oasis:names:tc:xacml:2.0:policy:schema:os"
    elementFormDefault="unqualified"
    attributeFormDefault="unqualified"
    blockDefault="substitution"
    version="2.0">
  <xs:import namespace="urn:oasis:names:tc:SAML:2.0:assertion"
      schemaLocation="http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=security"/>
  <xs:import namespace="urn:oasis:names:tc:SAML:2.0:protocol"
      schemaLocation="http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=security"/>
  <xs:import namespace="urn:oasis:names:tc:xacml:2.0:context:schema:os"
      schemaLocation="http://docs.oasis-open.org/xacml/2.0/access_control-xacml-2.0-context-schema-os.xsd"/>
  <xs:import namespace="urn:oasis:names:tc:xacml:2.0:policy:schema:os"
      schemaLocation="http://docs.oasis-open.org/xacml/2.0/access_control-xacml-2.0-policy-schema-os.xsd"/>
  <xs:annotation>
    <xs:documentation>
        Document identifier: access_control-xacml-2.0-saml-assertion-schema-cd-02.xsd
        Location: http://docs.oasis-open.org/xacml/2.0/access_control-xacml-2.0-saml-assertion-schema-cd-os.xsd
    </xs:documentation>
  </xs:annotation>
  
  <xs:element name="XACMLAuthzDecisionStatement"
           type="XACMLAuthzDecisionStatementType"/>
  <xs:complexType name="XACMLAuthzDecisionStatementType">
    <xs:complexContent>
      <xs:extension base="samlp:StatementAbstractType">
        <xs:sequence>
          <xs:element ref="xacml-context:Response"/>
          <xs:element ref="xacml-context:Request"  MinOccurs="0"/>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  
  <xs:element name="XACMLPolicyStatement"
           type="XACMLPolicyStatementType"/>
  <xs:complexType name="XACMLPolicyStatementType">
    <xs:complexContent>
      <xs:extension base="samlp:StatementAbstractType">
        <xs:choice minOccurs="0" maxOccurs="unbounded">>
          <xs:element ref="xacml:Policy"/>
          <xs:element ref="xacml:PolicySet"/>
        </xs:choice>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</schema>


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