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/usr/share/xml/shibboleth/shibboleth-2.0-attribute-map.xsd is in shibboleth-sp2-common 2.6.1+dfsg1-2.

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<?xml version="1.0" encoding="UTF-8"?>
<schema targetNamespace="urn:mace:shibboleth:2.0:attribute-map"
        xmlns="http://www.w3.org/2001/XMLSchema"
        xmlns:am="urn:mace:shibboleth:2.0:attribute-map"
        xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
        elementFormDefault="qualified"
        version="2.5">

    <import namespace="http://www.w3.org/2000/09/xmldsig#" schemaLocation="xmldsig-core-schema.xsd" />

    <annotation>
        <documentation>
            This schema maps SAML attributes into Shibboleth internal attributes.
        </documentation>
    </annotation>

    <simpleType name="string">
        <restriction base="string">
            <minLength value="1"/>
        </restriction>
    </simpleType>

    <simpleType name="anyURI">
        <restriction base="anyURI">
            <minLength value="1"/>
        </restriction>
    </simpleType>

    <simpleType name="listOfStrings">
        <list itemType="am:string"/>
    </simpleType>

    <complexType name="PluggableType">
        <sequence>
            <any namespace="##any" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
        </sequence>
        <attribute name="type" type="am:string" use="required"/>
        <anyAttribute namespace="##any" processContents="lax"/>
    </complexType>
    
    <element name="GSSAPIContext" type="base64Binary">
        <annotation>
            <documentation>A wrapper element for GSS-API contexts.</documentation>
        </annotation>
    </element>

    <element name="GSSAPIName" type="base64Binary">
        <annotation>
            <documentation>A wrapper element for GSS-API composite names.</documentation>
        </annotation>
    </element>
    
    <element name="Attributes">
        <annotation>
            <documentation>The set of SAML or GSS-API attribute mappings.</documentation>
        </annotation>
        <complexType>
            <sequence>
                <element name="MetadataProvider" type="am:PluggableType" minOccurs="0"/>
                <element name="TrustEngine" type="am:PluggableType" minOccurs="0"/>
                <element name="AttributeFilter" type="am:PluggableType" minOccurs="0"/>
                <choice maxOccurs="unbounded">
                    <element name="Attribute" type="am:AttributeType"/>
                    <element name="GSSAPIAttribute" type="am:GSSAPIAttributeType"/>
                </choice>
                <element ref="ds:Signature" minOccurs="0"/>
            </sequence>
            <attribute name="metadataAttributeCaching" type="boolean"/>
            <attribute name="metadataPolicyId" type="am:string"/>
        </complexType>
    </element>

    <complexType name="AttributeType">
        <annotation>
            <documentation>Rule for mapping a SAML attribute to an internal attribute.</documentation>
        </annotation>
        <sequence>
            <element name="AttributeDecoder" type="am:AttributeDecoderType" minOccurs="0"/>
        </sequence>
        <attribute name="id" type="am:string" use="required">
            <annotation>
                <documentation>The internal attribute ID to which this SAML attribute maps.</documentation>
            </annotation>
        </attribute>
        <attribute name="aliases" type="am:listOfStrings">
            <annotation>
                <documentation>Optional aliases for the internal attribute to which this SAML attribute maps.</documentation>
            </annotation>
        </attribute>
        <attribute name="name" type="am:string" use="required">
            <annotation>
                <documentation>The SAML 1 AttributeName or SAML 2 Name of the attribute.</documentation>
            </annotation>
        </attribute>
        <attribute name="nameFormat" type="am:string">
            <annotation>
                <documentation>The SAML 1 Namespace or SAML 2 NameFormat of the attribute.</documentation>
            </annotation>
        </attribute>
        <attribute name="isRequested" type="boolean">
          <annotation>
            <documentation>Marks an attribute as requested by the service.</documentation>
          </annotation>
        </attribute>
        <attribute name="isRequired" type="boolean">
          <annotation>
            <documentation>Marks an attribute as required by the service.</documentation>
          </annotation>
        </attribute>
    </complexType>

    <complexType name="GSSAPIAttributeType">
        <annotation>
            <documentation>Rule for mapping a GSS-API naming attribute to an internal attribute.</documentation>
        </annotation>
        <attribute name="id" type="am:string" use="required">
            <annotation>
                <documentation>The internal attribute ID to which this SAML attribute maps.</documentation>
            </annotation>
        </attribute>
        <attribute name="aliases" type="am:listOfStrings">
            <annotation>
                <documentation>Optional aliases for the internal attribute to which this SAML attribute maps.</documentation>
            </annotation>
        </attribute>
        <attribute name="name" type="am:string" use="required">
            <annotation>
                <documentation>The name of the naming attribute.</documentation>
            </annotation>
        </attribute>
        <attribute name="authenticated" type="boolean">
            <annotation>
                <documentation>If true, only an authenticated GSS-API naming attribute will be mapped.</documentation>
            </annotation>
        </attribute>
        <attribute name="binary" type="boolean">
            <annotation>
                <documentation>If true, the GSS-API naming attribute will be base64-encoded for internal use.</documentation>
            </annotation>
        </attribute>
        <attribute name="scopeDelimiter" type="am:string">
            <annotation>
                <documentation>
                    The character(s) used to delimit the scoped information from the scope.
                </documentation>
            </annotation>
        </attribute>
    </complexType>
    
    <complexType name="AttributeDecoderType" abstract="true">
        <annotation>
            <documentation>
                Decodes a SAML attribute into its Shibboleth-internal representation.
            </documentation>
        </annotation>
        <attribute name="caseSensitive" type="boolean">
            <annotation>
                <documentation>
                    Flag controlling case sensitivity when comparisons to the attribute's values are done.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="internal" type="boolean">
            <annotation>
                <documentation>
                    Flag controlling whether the resulting attribute should be exported for CGI use.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="langAware" type="boolean">
            <annotation>
                <documentation>
                    Flag controlling whether the decoder should select only the best matching value by language.
                </documentation>
            </annotation>
        </attribute>
        <attribute name="hashAlg" type="am:string">
            <annotation>
                <documentation>
                    Crypto-provider-specific name of hash algorithm to use,
                    turning the decoded result into a simple string.
                </documentation>
            </annotation>
        </attribute>
    </complexType>
    
    <complexType name="StringAttributeDecoder">
        <annotation>
            <documentation>
                Decoder for attributes with string values.
            </documentation>
        </annotation>
        <complexContent>
            <extension base="am:AttributeDecoderType" />
        </complexContent>
    </complexType>

    <complexType name="ScopedAttributeDecoder">
        <annotation>
            <documentation>
                Decoder for attributes with scoped values.
            </documentation>
        </annotation>
        <complexContent>
            <extension base="am:AttributeDecoderType">
                <attribute name="scopeDelimiter" type="am:string">
                    <annotation>
                        <documentation>
                            The character(s) used to delimit the scoped information from the scope.
                        </documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>
    
    <complexType name="NameIDAttributeDecoder">
        <annotation>
            <documentation>
                Decoder for attributes with NameID values.
            </documentation>
        </annotation>
        <complexContent>
            <extension base="am:AttributeDecoderType">
                <attribute name="formatter" type="am:string">
                    <annotation>
                        <documentation>
                            The pattern used to generate string versions of the attribute's values.
                        </documentation>
                    </annotation>
                </attribute>
                <attribute name="defaultQualifiers" type="boolean">
                    <annotation>
                        <documentation>
                            Flag controlling whether to default in values for NameQualifier/SPNameQualifier if not set.
                        </documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>

    <complexType name="NameIDFromScopedAttributeDecoder">
        <annotation>
            <documentation>
                Decoder for attributes with scoped values that produces a NameID attribute with
                the scope dropped and the NameQualifiers defaulted.
            </documentation>
        </annotation>
        <complexContent>
            <extension base="am:ScopedAttributeDecoder">
                <attribute name="format" type="am:anyURI">
                    <annotation>
                        <documentation>
                            Value to use as the NameID Format.
                        </documentation>
                    </annotation>
                </attribute>
                <attribute name="defaultQualifiers" type="boolean">
                    <annotation>
                        <documentation>
                            Flag controlling whether to default in values for NameQualifier/SPNameQualifier if not set.
                        </documentation>
                    </annotation>
                </attribute>
                <attribute name="formatter" type="am:string">
                    <annotation>
                        <documentation>
                            The pattern used to generate string versions of the attribute's values.
                        </documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>

    <complexType name="KeyInfoAttributeDecoder">
        <annotation>
            <documentation>
                Decoder for attributes with ds:KeyInfo values.
            </documentation>
        </annotation>
        <complexContent>
            <extension base="am:AttributeDecoderType">
                <sequence>
                    <element name="KeyInfoResolver" type="am:PluggableType" minOccurs="0"/>
                </sequence>
                <attribute name="hash" type="boolean">
                    <annotation>
                        <documentation>
                            Flag controlling whether to hash keys before base64-encoding them.
                        </documentation>
                    </annotation>
                </attribute>
                <attribute name="keyInfoHashAlg" type="am:string">
                    <annotation>
                        <documentation>
                            Crypto-provider-specific name of hash algorithm to use.
                        </documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>

    <complexType name="XMLAttributeDecoder">
        <annotation>
            <documentation>
                Decoder for directly serializing XML values.
            </documentation>
        </annotation>
        <complexContent>
            <extension base="am:AttributeDecoderType"/>
        </complexContent>
    </complexType>

    <complexType name="DOMAttributeDecoder">
        <annotation>
            <documentation>
                Decoder for extracting information from XML values.
            </documentation>
        </annotation>
        <complexContent>
            <extension base="am:AttributeDecoderType">
                <sequence>
                    <element name="Mapping" minOccurs="0">
                        <annotation>
                            <documentation>Optional transform to turn qualified XML names into string names.</documentation>
                        </annotation>
                        <complexType>
                            <attribute name="from" type="QName" use="required"/>
                            <attribute name="to" type="am:string" use="required"/>
                        </complexType>
                    </element>
                </sequence>
                <attribute name="formatter" type="am:string">
                    <annotation>
                        <documentation>
                            The pattern used to generate strings from the XML.
                        </documentation>
                    </annotation>
                </attribute>
            </extension>
        </complexContent>
    </complexType>

    <complexType name="Base64AttributeDecoder">
        <annotation>
            <documentation>
                Decoder for attributes with base64-encoded string values.
            </documentation>
        </annotation>
        <complexContent>
            <extension base="am:AttributeDecoderType" />
        </complexContent>
    </complexType>

</schema>