<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:simpleType name="bool">
    <xs:restriction base="xs:int">
      <xs:enumeration value="0" />
      <xs:enumeration value="1" />
    </xs:restriction>
  </xs:simpleType>

  <!-- Entity name, might include spaces and punctuation. -->
  <xs:simpleType name="name">
    <xs:restriction base="xs:token">
      <xs:minLength value="1" />
    </xs:restriction>
  </xs:simpleType>

  <!-- Possibly empty entity name. -->
  <xs:simpleType name="nameOrEmpty">
    <xs:restriction base="xs:token" />
  </xs:simpleType>

  <xs:simpleType name="empty">
    <xs:restriction base="xs:token">
      <xs:enumeration value="" />
    </xs:restriction>
  </xs:simpleType>

  <!-- Arbitrary C++ expression. Might be empty in some corner cases. -->
  <xs:simpleType name="expression">
    <xs:restriction base="xs:token" />
  </xs:simpleType>

  <!--
    A space separated list of declaration attributes, inlcuding:
    deprecated, dllexport, dllimport, final, override, __stdcall__,
    __fastcall__, __thiscall__ annotate(...).
    Note that it isn't a valid XML list, because annotate(...) might contain
    spaces.
  -->
  <xs:simpleType name="attributes">
    <xs:restriction base="xs:token" />
  </xs:simpleType>

  <xs:simpleType name="access">
    <xs:restriction base="xs:token">
      <xs:enumeration value="public" />
      <xs:enumeration value="protected" />
      <xs:enumeration value="private" />
    </xs:restriction>
  </xs:simpleType>

  <xs:simpleType name="elaboration-keyword">
    <xs:restriction base="xs:token">
      <xs:enumeration value="enum" />
      <xs:enumeration value="union" />
      <xs:enumeration value="class" />
      <xs:enumeration value="struct" />
      <xs:enumeration value="typename" />
      <xs:enumeration value="__interface" />
    </xs:restriction>
  </xs:simpleType>

  <xs:attributeGroup name="abi">
    <xs:attribute name="size" type="xs:unsignedLong" />
    <xs:attribute name="align" type="xs:unsignedLong" />
  </xs:attributeGroup>

  <xs:attributeGroup name="optionalAbi">
    <xs:attribute name="size" type="xs:unsignedLong" use="optional" />
    <xs:attribute name="align" type="xs:unsignedLong" use="optional" />
  </xs:attributeGroup>

  <xs:attributeGroup name="location">
    <xs:attribute name="location" use="optional">
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:pattern value="f[0-9]+:[0-9]+" />
        </xs:restriction>
      </xs:simpleType>
    </xs:attribute>
    <xs:attribute name="file" type="xs:IDREF" use="optional" />
    <xs:attribute name="line" type="xs:unsignedLong" use="optional" />
  </xs:attributeGroup>

  <xs:complexType name="Function">
    <xs:sequence>
      <xs:element name="Argument" minOccurs="0" maxOccurs="unbounded">
        <xs:complexType>
          <xs:attribute name="name" type="name" use="optional" />
          <xs:attribute name="type" type="xs:IDREF" />
          <xs:attribute name="original_type" type="xs:IDREF" use="optional" />
          <xs:attributeGroup ref="location" />
          <xs:attribute name="default" type="expression" use="optional" />
          <xs:attribute name="attributes" type="attributes" use="optional" />
          <xs:attribute name="deprecation" type="name" use="optional"/>
          <xs:attribute name="annotation" type="name" use="optional"/>
        </xs:complexType>
      </xs:element>
      <xs:element name="Ellipsis" minOccurs="0" />
    </xs:sequence>
    <xs:attribute name="id" type="xs:ID" />
    <!-- Artificial members or anonymous structs (like ctor) might have an empty name. -->
    <xs:attribute name="name" type="nameOrEmpty" />
    <!-- Only constructors lack returns attribute. -->
    <xs:attribute name="returns" type="xs:IDREF" use="optional" />
    <xs:attribute name="context" type="xs:IDREF" use="optional" />
    <xs:attribute name="static" type="xs:int" use="optional" fixed="1" />
    <xs:attribute name="inline" type="xs:int" use="optional" fixed="1" />
    <xs:attribute name="extern" type="xs:int" use="optional" fixed="1" />
    <xs:attribute name="artificial" type="xs:int" use="optional" fixed="1" />
    <xs:attribute name="throw" type="xs:IDREFS" use="optional" />
    <xs:attribute name="mangled" type="xs:string" />
    <xs:attribute name="deprecation" type="name" use="optional"/>
    <xs:attribute name="annotation" type="name" use="optional"/>
    <xs:attribute name="attributes" type="attributes" use="optional" />
    <xs:attribute name="comment" type="xs:IDREF" use="optional" />
    <xs:attributeGroup ref="location" />
  </xs:complexType>

  <xs:complexType name="Method">
    <xs:complexContent>
      <xs:extension base="Function">
        <xs:attribute name="access" type="access" />
        <xs:attribute name="explicit" type="xs:int" use="optional" fixed="1" />
        <xs:attribute name="const" type="xs:int" use="optional" fixed="1" />
        <xs:attribute name="virtual" type="xs:int" use="optional" fixed="1" />
        <xs:attribute name="pure_virtual" type="xs:int" use="optional" fixed="1" />
        <xs:attribute name="overrides" type="xs:IDREFS" use="optional" />
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>

  <xs:complexType name="FunctionType">
    <xs:sequence>
      <xs:element name="Argument" minOccurs="0" maxOccurs="unbounded">
        <xs:complexType>
          <xs:attribute name="type" type="xs:IDREF" />
        </xs:complexType>
      </xs:element>
      <xs:element name="Ellipsis" minOccurs="0" />
    </xs:sequence>
    <xs:attribute name="id" type="xs:ID" />
    <xs:attribute name="returns" type="xs:IDREF" />
    <xs:attribute name="const" type="xs:int" use="optional" fixed="1" />
    <xs:attribute name="volatile" type="xs:int" use="optional" fixed="1" />
    <xs:attribute name="restrict" type="xs:int" use="optional" fixed="1" />
    <xs:attribute name="attributes" type="attributes" use="optional" />
    <xs:attribute name="deprecation" type="name" use="optional"/>
    <xs:attribute name="annotation" type="name" use="optional"/>
  </xs:complexType>

  <xs:complexType name="Record">
    <xs:sequence>
      <xs:element name="Base" minOccurs="0" maxOccurs="unbounded">
        <xs:complexType>
          <xs:attribute name="type" type="xs:IDREF" />
          <xs:attribute name="access" type="access" />
          <xs:attribute name="virtual" type="bool" />
          <xs:attribute name="offset" type="xs:unsignedLong" use="optional" />
        </xs:complexType>
      </xs:element>
    </xs:sequence>
    <xs:attribute name="id" type="xs:ID" />
    <!-- Anonymous records might have an empty name. -->
    <xs:attribute name="name" type="nameOrEmpty" use="optional" />
    <xs:attribute name="context" type="xs:IDREF" use="optional" />
    <xs:attribute name="access" type="access" use="optional" />
    <xs:attributeGroup ref="location" />
    <xs:attribute name="comment" type="xs:IDREF" use="optional" />
    <xs:attribute name="incomplete" type="xs:int" use="optional" fixed="1" />
    <!-- All of the following attributes are for complete declarations only. -->
    <xs:attribute name="abstract" type="xs:int" use="optional" fixed="1" />
    <xs:attribute name="members" type="xs:IDREFS" use="optional" />
    <xs:attribute name="bases" use="optional">
      <xs:simpleType>
        <xs:list>
          <xs:simpleType>
            <xs:restriction base="xs:token">
              <xs:pattern value="(private:|protected:)?_[0-9]+" />
            </xs:restriction>
          </xs:simpleType>
        </xs:list>
      </xs:simpleType>
    </xs:attribute>
    <xs:attribute name="befriending" type="xs:IDREFS" use="optional" />
    <xs:attributeGroup ref="optionalAbi" />
    <xs:attribute name="attributes" type="attributes" use="optional" />
    <xs:attribute name="deprecation" type="name" use="optional"/>
    <xs:attribute name="annotation" type="name" use="optional"/>
  </xs:complexType>

  <xs:complexType name="Items">
    <xs:choice minOccurs="0" maxOccurs="unbounded">

      <xs:element name="File">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <!-- Name can be a "/"-delimited path or the string "<builtin>". -->
          <xs:attribute name="name" type="name" />
        </xs:complexType>
      </xs:element>

      <xs:element name="Namespace">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <!-- Global namespace is named "::". -->
          <xs:attribute name="name" type="name" use="optional" />
          <xs:attribute name="context" type="xs:IDREF" use="optional" />
          <xs:attribute name="members" type="xs:IDREFS" use="optional" />
          <xs:attribute name="comment" type="xs:IDREF" use="optional" />
        </xs:complexType>
      </xs:element>

      <xs:element name="Comment">
        <xs:complexType>
          <!-- Note that the actual comment text isn't present. -->
          <xs:attribute name="id" type="xs:ID" />
          <xs:attribute name="attached" type="xs:IDREF" />
          <xs:attribute name="file" type="xs:IDREF" />
          <xs:attribute name="begin_line" type="xs:unsignedInt" />
          <xs:attribute name="begin_column" type="xs:unsignedInt" />
          <xs:attribute name="begin_offset" type="xs:unsignedInt" />
          <xs:attribute name="end_line" type="xs:unsignedInt" />
          <xs:attribute name="end_column" type="xs:unsignedInt" />
          <xs:attribute name="end_offset" type="xs:unsignedInt" />
        </xs:complexType>
      </xs:element>

      <xs:element name="Struct" type="Record" />

      <xs:element name="Union" type="Record" />

      <xs:element name="Class" type="Record" />

      <xs:element name="Enumeration">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="EnumValue" minOccurs="0" maxOccurs="unbounded">
              <xs:complexType>
                <xs:attribute name="name" type="name" />
                <xs:attribute name="init" type="xs:long" />
                <xs:attribute name="attributes" type="attributes" use="optional" />
                <xs:attribute name="deprecation" type="name" use="optional"/>
                <xs:attribute name="annotation" type="name" use="optional"/>
              </xs:complexType>
            </xs:element>
          </xs:sequence>
          <xs:attribute name="id" type="xs:ID" />
          <!-- Anonymous enums might have an empty name. -->
          <xs:attribute name="name" type="nameOrEmpty" />
          <xs:attribute name="type" type="xs:IDREF" />
          <xs:attribute name="context" type="xs:IDREF" use="optional" />
          <!-- Access is available for enums in class context. -->
          <xs:attribute name="access" type="access" use="optional" />
          <xs:attributeGroup ref="location" />
          <xs:attribute name="scoped" type="xs:int" use="optional" fixed="1" />
          <xs:attributeGroup ref="abi" />
          <xs:attribute name="attributes" type="attributes" use="optional" />
          <xs:attribute name="deprecation" type="name" use="optional"/>
          <xs:attribute name="annotation" type="name" use="optional"/>
          <xs:attribute name="comment" type="xs:IDREF" use="optional" />
        </xs:complexType>
      </xs:element>

      <xs:element name="Variable">
        <!-- Includes static variables in records. -->
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <xs:attribute name="name" type="name" />
          <xs:attribute name="type" type="xs:IDREF" />
          <xs:attribute name="init" type="expression" use="optional" />
          <xs:attribute name="context" type="xs:IDREF" use="optional" />
          <xs:attribute name="access" type="access" use="optional" />
          <xs:attributeGroup ref="location" />
          <xs:attribute name="static" type="xs:int" use="optional" fixed="1" />
          <xs:attribute name="extern" type="xs:int" use="optional" fixed="1" />
          <xs:attribute name="mangled" type="xs:string" />
          <xs:attribute name="attributes" type="attributes" use="optional" />
          <xs:attribute name="comment" type="xs:IDREF" use="optional" />
          <xs:attribute name="deprecation" type="name" use="optional"/>
          <xs:attribute name="annotation" type="name" use="optional"/>
        </xs:complexType>
      </xs:element>

      <xs:element name="Field">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <!-- Fields of anonymous record types might have an empty name.  -->
          <xs:attribute name="name" type="nameOrEmpty" />
          <xs:attribute name="type" type="xs:IDREF" />
          <xs:attribute name="init" type="expression" use="optional" />
          <xs:attribute name="bits" type="xs:unsignedInt" use="optional" />
          <xs:attribute name="context" type="xs:IDREF" />
          <xs:attribute name="access" type="access" />
          <xs:attributeGroup ref="location" />
          <xs:attribute name="offset" type="xs:unsignedLong" />
          <xs:attribute name="mutable" type="xs:int" use="optional" fixed="1" />
          <xs:attribute name="attributes" type="attributes" use="optional" />
          <xs:attribute name="comment" type="xs:IDREF" use="optional" />
          <xs:attribute name="deprecation" type="name" use="optional"/>
          <xs:attribute name="annotation" type="name" use="optional"/>
        </xs:complexType>
      </xs:element>

      <xs:element name="Function" type="Function" />

      <xs:element name="OperatorFunction" type="Function" />

      <xs:element name="Constructor" type="Method" />

      <xs:element name="Destructor" type="Method" />

      <xs:element name="Method" type="Method" />

      <xs:element name="OperatorMethod" type="Method" />

      <xs:element name="Converter" type="Method" />

      <xs:element name="Typedef">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <xs:attribute name="name" type="name" />
          <xs:attribute name="type" type="xs:IDREF" />
          <xs:attribute name="context" type="xs:IDREF" use="optional" />
          <!-- Access is available for typedefs in class context. -->
          <xs:attribute name="access" type="access" use="optional" />
          <xs:attributeGroup ref="location" />
          <xs:attribute name="attributes" type="attributes" use="optional" />
          <xs:attribute name="comment" type="xs:IDREF" use="optional" />
          <xs:attribute name="deprecation" type="name" use="optional"/>
          <xs:attribute name="annotation" type="name" use="optional"/>
        </xs:complexType>
      </xs:element>

      <xs:element name="FundamentalType">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <xs:attribute name="name" type="name" />
          <xs:attributeGroup ref="abi" />
        </xs:complexType>
      </xs:element>

      <xs:element name="CvQualifiedType">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <xs:attribute name="type" type="xs:IDREF" />
          <xs:attribute name="const" type="xs:int" use="optional" fixed="1" />
          <xs:attribute name="volatile" type="xs:int" use="optional" fixed="1" />
          <xs:attribute name="restrict" type="xs:int" use="optional" fixed="1" />
        </xs:complexType>
      </xs:element>

      <xs:element name="AtomicType">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <xs:attribute name="type" type="xs:IDREF" />
          <xs:attributeGroup ref="abi" />
        </xs:complexType>
      </xs:element>

      <xs:element name="AutoType">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
        </xs:complexType>
      </xs:element>

      <xs:element name="PointerType">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <xs:attribute name="type" type="xs:IDREF" />
          <!-- Member function pointers lack ABI information. -->
          <xs:attributeGroup ref="optionalAbi" />
        </xs:complexType>
      </xs:element>

      <xs:element name="OffsetType">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <xs:attribute name="basetype" type="xs:IDREF" />
          <xs:attribute name="type" type="xs:IDREF" />
        </xs:complexType>
      </xs:element>

      <xs:element name="ReferenceType">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <xs:attribute name="type" type="xs:IDREF" />
          <xs:attributeGroup ref="abi" />
        </xs:complexType>
      </xs:element>

      <xs:element name="RValueReferenceType">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <xs:attribute name="type" type="xs:IDREF" />
          <xs:attributeGroup ref="abi" />
        </xs:complexType>
      </xs:element>

      <xs:element name="ArrayType">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <xs:attribute name="type" type="xs:IDREF" />
          <xs:attribute name="min" type="xs:unsignedLong" fixed="0" />
          <!--
            For unbounded arrays, max is an empty string.
            For explicitly zero length arrays, max is -1.
          -->
          <xs:attribute name="max">
            <xs:simpleType>
              <xs:union memberTypes="xs:long empty" />
            </xs:simpleType>
          </xs:attribute>
        </xs:complexType>
      </xs:element>

      <xs:element name="ElaboratedType">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <xs:attribute name="type" type="xs:IDREF" />
          <xs:attribute name="keyword" type="elaboration-keyword" use="optional" />
          <xs:attribute name="qualifier" type="name" use="optional" />
        </xs:complexType>
      </xs:element>

      <xs:element name="FunctionType" type="FunctionType" />

      <xs:element name="MethodType">
        <xs:complexType>
          <xs:complexContent>
            <xs:extension base="FunctionType">
              <xs:attribute name="basetype" type="xs:IDREF" />
            </xs:extension>
          </xs:complexContent>
        </xs:complexType>
      </xs:element>

      <xs:element name="Unimplemented">
        <xs:complexType>
          <xs:attribute name="id" type="xs:ID" />
          <!-- kind is set for unimplemented declarations, type_class for types. -->
          <xs:attribute name="kind" type="name" use="optional" />
          <xs:attribute name="type_class" type="name" use="optional" />
        </xs:complexType>
      </xs:element>
    </xs:choice>
  </xs:complexType>

  <!-- castxml-output=1 output root. -->
  <xs:element name="CastXML">
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="Items">
          <xs:attribute name="format">
            <xs:simpleType>
              <xs:restriction base="xs:token">
                <xs:pattern value="1(\.[0-9]+)*" />
              </xs:restriction>
            </xs:simpleType>
          </xs:attribute>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>

  <!-- castxml-gccxml output root. -->
  <xs:element name="GCC_XML">
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="Items">
          <xs:attribute name="version" type="xs:token" fixed="0.9.0" />
          <xs:attribute name="cvs_revision" type="xs:token" fixed="1.145" />
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>
</xs:schema>
