<?xml version="1.0"?><xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">  <xsd:annotation>    <xsd:documentation xml:lang="en">      Mini-XML 2.3 documentation schema for mxmldoc output.      Copyright 2003-2007 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>