DAP4 Attribute XML schema

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="http://xml.opendap.org/ns/DAP/3.3/att#"
    xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:dap="http://xml.opendap.org/ns/DAP/3.3/att#"
    xmlns="http://xml.opendap.org/ns/DAP/3.3/att#" elementFormDefault="qualified"
    attributeFormDefault="unqualified">
    <!--
	
	-->
    <xs:element name="Byte" type="AttributeByteType"/>
    <xs:element name="Int16" type="AttributeInt16Type"/>
    <xs:element name="UInt16" type="AttributeUInt16Type"/>
    <xs:element name="Int32" type="AttributeInt32Type"/>
    <xs:element name="UInt32" type="AttributeUInt32Type"/>
    <xs:element name="Float32" type="AttributeFloat32Type"/>
    <xs:element name="Float64" type="AttributeFloat64Type"/>
    <xs:element name="String" type="AttributeStringType"/>
    <xs:element name="Url" type="AttributeUrlType"/>
    <xs:element name="Container" type="AttributeContainerType"/>
    <xs:element name="Xml" type="AttributeXmlType"/>
    <!--
	
	-->
    <xs:group name="allAttributeTypes">
        <xs:annotation>
            <xs:documentation>Reusable Content Model for Container type</xs:documentation>
        </xs:annotation>
        <xs:choice>
            <xs:element ref="Byte" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="Int16" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="UInt16" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="Int32" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="UInt32" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="Float32" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="Float64" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="String" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="Url" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="Container" minOccurs="0" maxOccurs="unbounded"/>
            <xs:element ref="Xml" minOccurs="0" maxOccurs="unbounded"/>
        </xs:choice>
    </xs:group>
    <!--
        
    -->
    <xs:complexType name="AttributeContainerType">
        <xs:annotation>
            <xs:documentation>DAP Attribute Container Type</xs:documentation>
        </xs:annotation>
        <xs:choice>
            <xs:group ref="allAttributeTypes" minOccurs="1" maxOccurs="unbounded"/>
        </xs:choice>
        <xs:attribute name="name" type="xs:string" use="required"/>
    </xs:complexType>
    <!--
	
	-->
    <xs:complexType name="AttributeByteType">
        <xs:annotation>
            <xs:documentation>DAP Attribute Byte Type</xs:documentation>
        </xs:annotation>
        <xs:choice>
            <xs:element name="value" type="xs:unsignedByte" minOccurs="1" maxOccurs="unbounded"/>
        </xs:choice>
        <xs:attribute name="name" type="xs:string" use="required"/>
    </xs:complexType>
    <!--
        
    -->
    <xs:complexType name="AttributeInt16Type">
        <xs:annotation>
            <xs:documentation>DAP Attribute Int16 Type</xs:documentation>
        </xs:annotation>
        <xs:choice>
            <xs:element name="value" type="xs:short" minOccurs="1" maxOccurs="unbounded"/>
        </xs:choice>
        <xs:attribute name="name" type="xs:string" use="required"/>
    </xs:complexType>
    <!--
        
    -->
    <xs:complexType name="AttributeUInt16Type">
        <xs:annotation>
            <xs:documentation>DAP Attribute UInt16 Type</xs:documentation>
        </xs:annotation>
        <xs:choice>
            <xs:element name="value" type="xs:unsignedShort" minOccurs="1" maxOccurs="unbounded"/>
        </xs:choice>
        <xs:attribute name="name" type="xs:string" use="required"/>
    </xs:complexType>
    <!--
        
    -->
    <xs:complexType name="AttributeInt32Type">
        <xs:annotation>
            <xs:documentation>DAP Attribute Int32 Type</xs:documentation>
        </xs:annotation>
        <xs:choice>
            <xs:element name="value" type="xs:int" minOccurs="1" maxOccurs="unbounded"/>
        </xs:choice>
        <xs:attribute name="name" type="xs:string" use="required"/>
    </xs:complexType>
    <!--
        
    -->
    <xs:complexType name="AttributeUInt32Type">
        <xs:annotation>
            <xs:documentation>DAP Attribute UInt32 Type</xs:documentation>
        </xs:annotation>
        <xs:choice>
            <xs:element name="value" type="xs:unsignedInt" minOccurs="1" maxOccurs="unbounded"/>
        </xs:choice>
        <xs:attribute name="name" type="xs:string" use="required"/>
    </xs:complexType>
    <!--
        
    -->
    <xs:complexType name="AttributeFloat32Type">
        <xs:annotation>
            <xs:documentation>DAP Attribute Float32 Type</xs:documentation>
        </xs:annotation>
        <xs:choice>
            <xs:element name="value" type="xs:float" minOccurs="1" maxOccurs="unbounded"/>
        </xs:choice>
        <xs:attribute name="name" type="xs:string" use="required"/>
    </xs:complexType>
    <!--
        
    -->
    <xs:complexType name="AttributeFloat64Type">
        <xs:annotation>
            <xs:documentation>DAP Attribute Float64 Type</xs:documentation>
        </xs:annotation>
        <xs:choice>
            <xs:element name="value" type="xs:double" minOccurs="1" maxOccurs="unbounded"/>
        </xs:choice>
        <xs:attribute name="name" type="xs:string" use="required"/>
    </xs:complexType>
    <!--
        
    -->
    <xs:complexType name="AttributeStringType">
        <xs:annotation>
            <xs:documentation>DAS Attribute String Type</xs:documentation>
        </xs:annotation>
        <xs:choice>
            <xs:element name="value" type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
        </xs:choice>
        <xs:attribute name="name" type="xs:string" use="required"/>
    </xs:complexType>
    <!--
       -
       - This allows the URL type to contain anyURI. We need to modifiy the schema so that it really is
       - any URL. 
       -
       - OR 
       -
       - We need to relax the DAP definition of the URL Attribute type.
       -       
    -->
    <xs:complexType name="AttributeUrlType">
        <xs:annotation>
            <xs:documentation>DAS Attribute URL Type</xs:documentation>
        </xs:annotation>
        <xs:choice>
            <xs:element name="value" type="xs:anyURI" minOccurs="1" maxOccurs="unbounded"/>
        </xs:choice>
        <xs:attribute name="name" type="xs:string" use="required"/>
    </xs:complexType>
    <!--
       -       - This allows any XML not in the DAP Attribute namespace. We should try to make this
       - any XML not in the DAP or the DAP ATtribute namespace.
       - IE: XML not in http://xml.opendap.org/ns/DAP/3.3/att# or http://xml.opendap.org/ns/DAP/3.3/dap#
       -        
    -->
    <xs:complexType name="AttributeXmlType">
        <xs:annotation>
            <xs:documentation>DAS Attribute XML Type</xs:documentation>
        </xs:annotation>
        <xs:choice>
            <xs:any namespace="##other" minOccurs="1" maxOccurs="unbounded" processContents="strict"
            />
        </xs:choice>
        <xs:attribute name="name" type="xs:string" use="required"/>
    </xs:complexType>
    <!--
        
    -->
</xs:schema>