<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <xsd:annotation>
    <xsd:documentation xml:lang="en">
      Mini-XML 2.2 documentation schema for mxmldoc output.
      Copyright 2003-2005 by Michael Sweet.

      This program is free software; you can redistribute it and/or
      modify it under the terms of the GNU Library General Public
      License as published by the Free Software Foundation; either
      version 2, or (at your option) any later version.

      This program is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU General Public License for more details.
    </xsd:documentation>
  </xsd:annotation>

  <!-- basic element definitions -->
  <xsd:element name="argument" type="argumentType"/>
  <xsd:element name="class" type="classType"/>
  <xsd:element name="constant" type="constantType"/>
  <xsd:element name="description" type="xsd:string"/>
  <xsd:element name="enumeration" type="enumerationType"/>
  <xsd:element name="function" type="functionType"/>
  <xsd:element name="mxmldoc" type="mxmldocType"/>
  <xsd:element name="namespace" type="namespaceType"/>
  <xsd:element name="returnvalue" type="returnvalueType"/>
  <xsd:element name="seealso" type="identifierList"/>
  <xsd:element name="struct" type="structType"/>
  <xsd:element name="typedef" type="typedefType"/>
  <xsd:element name="type" type="xsd:string"/>
  <xsd:element name="union" type="unionType"/>
  <xsd:element name="variable" type="variableType"/>

  <!-- descriptions of complex elements -->
  <xsd:complexType name="argumentType">
    <xsd:sequence>
      <xsd:element ref="type" minOccurs="1" maxOccurs="1"/>
      <xsd:element ref="description" minOccurs="0" maxOccurs="1"/>
    </xsd:sequence>
    <xsd:attribute name="default" type="xsd:string" use="optional"/>
    <xsd:attribute name="name" type="identifier" use="required"/>
    <xsd:attribute name="direction" type="direction" use="optional" default="I"/>
  </xsd:complexType>

  <xsd:complexType name="classType">
    <xsd:sequence>
      <xsd:element ref="description" minOccurs="0" maxOccurs="1"/>
      <xsd:choice minOccurs="0" maxOccurs="unbounded">
	<xsd:element ref="class"/>
	<xsd:element ref="enumeration"/>
	<xsd:element ref="function"/>
	<xsd:element ref="struct"/>
	<xsd:element ref="typedef"/>
	<xsd:element ref="union"/>
	<xsd:element ref="variable"/>
      </xsd:choice>
    </xsd:sequence>
    <xsd:attribute name="name" type="identifier" use="required"/>
    <xsd:attribute name="parent" type="xsd:string" use="optional"/>
  </xsd:complexType>

  <xsd:complexType name="constantType">
    <xsd:sequence>
      <xsd:element ref="description" minOccurs="0" maxOccurs="1"/>
    </xsd:sequence>
    <xsd:attribute name="name" type="identifier" use="required"/>
  </xsd:complexType>

  <xsd:complexType name="enumerationType">
    <xsd:sequence>
      <xsd:element ref="description" minOccurs="0" maxOccurs="1"/>
      <xsd:element ref="constant" minOccurs="1" maxOccurs="unbounded"/>
    </xsd:sequence>
    <xsd:attribute name="name" type="identifier" use="required"/>
  </xsd:complexType>

  <xsd:complexType name="functionType">
    <xsd:sequence>
      <xsd:element ref="returnvalue" minOccurs="0" maxOccurs="1"/>
      <xsd:element ref="description" minOccurs="0" maxOccurs="1"/>
      <xsd:element ref="argument" minOccurs="1" maxOccurs="unbounded"/>
      <xsd:element ref="seealso" minOccurs="0" maxOccurs="1"/>
    </xsd:sequence>
    <xsd:attribute name="name" type="identifier" use="required"/>
    <xsd:attribute name="scope" type="scope" use="optional"/>
  </xsd:complexType>

  <xsd:complexType name="mxmldocType">
    <xsd:choice minOccurs="0" maxOccurs="unbounded">
      <xsd:element ref="class"/>
      <xsd:element ref="enumeration"/>
      <xsd:element ref="function"/>
      <xsd:element ref="namespace"/>
      <xsd:element ref="struct"/>
      <xsd:element ref="typedef"/>
      <xsd:element ref="union"/>
      <xsd:element ref="variable"/>
    </xsd:choice>
  </xsd:complexType>

  <xsd:complexType name="namespaceType">
    <xsd:sequence>
      <xsd:element ref="description" minOccurs="0" maxOccurs="1"/>
      <xsd:choice minOccurs="0" maxOccurs="unbounded">
	<xsd:element ref="class"/>
	<xsd:element ref="enumeration"/>
	<xsd:element ref="function"/>
	<xsd:element ref="struct"/>
	<xsd:element ref="typedef"/>
	<xsd:element ref="union"/>
	<xsd:element ref="variable"/>
      </xsd:choice>
    </xsd:sequence>
    <xsd:attribute name="name" type="identifier" use="required"/>
  </xsd:complexType>

  <xsd:complexType name="returnvalueType">
    <xsd:sequence>
      <xsd:element ref="type" minOccurs="1" maxOccurs="1"/>
      <xsd:element ref="description" minOccurs="0" maxOccurs="1"/>
    </xsd:sequence>
  </xsd:complexType>

  <xsd:complexType name="structType">
    <xsd:sequence>
      <xsd:element ref="description" minOccurs="0" maxOccurs="1"/>
      <xsd:choice minOccurs="0" maxOccurs="unbounded">
	<xsd:element ref="variable"/>
	<xsd:element ref="function"/>
      </xsd:choice>
    </xsd:sequence>
    <xsd:attribute name="name" type="identifier" use="required"/>
  </xsd:complexType>

  <xsd:complexType name="typedefType">
    <xsd:sequence>
      <xsd:element ref="type" minOccurs="1" maxOccurs="1"/>
      <xsd:element ref="description" minOccurs="0" maxOccurs="1"/>
    </xsd:sequence>
    <xsd:attribute name="name" type="identifier" use="required"/>
  </xsd:complexType>

  <xsd:complexType name="unionType">
    <xsd:sequence>
      <xsd:element ref="description" minOccurs="0" maxOccurs="1"/>
      <xsd:element ref="variable" minOccurs="0" maxOccurs="unbounded"/>
    </xsd:sequence>
    <xsd:attribute name="name" type="identifier" use="required"/>
  </xsd:complexType>

  <xsd:complexType name="variableType">
    <xsd:sequence>
      <xsd:element ref="type" minOccurs="1" maxOccurs="1"/>
      <xsd:element ref="description" minOccurs="0" maxOccurs="1"/>
    </xsd:sequence>
    <xsd:attribute name="name" type="identifier" use="required"/>
  </xsd:complexType>

  <!-- data types -->
  <xsd:simpleType name="direction">
    <xsd:restriction base="xsd:string">
      <xsd:enumeration value="I"/>
      <xsd:enumeration value="O"/>
      <xsd:enumeration value="IO"/>
    </xsd:restriction>
  </xsd:simpleType>

  <xsd:simpleType name="identifier">
    <xsd:restriction base="xsd:string">
      <xsd:pattern value="[a-zA-Z_(.]([a-zA-Z_(.,)* 0-9])*"/>
    </xsd:restriction>
  </xsd:simpleType>

  <xsd:simpleType name="identifierList">
    <xsd:list itemType="identifier"/>
  </xsd:simpleType>

  <xsd:simpleType name="scope">
    <xsd:restriction base="xsd:string">
      <xsd:enumeration value=""/>
      <xsd:enumeration value="private"/>
      <xsd:enumeration value="protected"/>
      <xsd:enumeration value="public"/>
    </xsd:restriction>
  </xsd:simpleType>
</xsd:schema>
