<?xml version="1.0" encoding="ISO-8859-1" ?>
<!-- 
     This is the scheme describing the XML output of the help-xml
     option. 
     
     Copyright (c) Leipzig, Madrid 1999-2015 Gert Wollny
     
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, 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.
     
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
     -->

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <!-- definition of attributes -->
  <xs:attribute name="short" type="xs:string"/>
  <xs:attribute name="long" type="xs:string"/>
  <xs:attribute name="required" type="xs:boolean"/>
  <xs:attribute name="default" type="xs:string"/>
  <xs:attribute name="name" type="xs:string"/>
  <xs:attribute name="type" type="xs:string"/>
  <xs:attribute name="min" type="xs:float"/>
  <xs:attribute name="max" type="xs:float"/>
  
  <!-- complex elements -->
  <xs:element name="name" type="xs:string" />
  <xs:element name="section" type="xs:string" />
  <xs:element name="description" type="xs:string" />
  <xs:element name="basic_usage" type="xs:string" />
  <xs:element name="whatis" type="xs:string" />

  <xs:element name="value">
    <xs:complexType mixed="true">
      <xs:attribute ref="name"/>    
    </xs:complexType>
  </xs:element>

  <xs:element name="dict">
    <xs:complexType>
      <xs:sequence>
	<xs:element ref="value" minOccurs="2" maxOccurs="unbounded"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  
  <xs:element name="range">
    <xs:complexType>
      <xs:attribute ref="min" use="required"/>
      <xs:attribute ref="max" use="required"/>
    </xs:complexType>
  </xs:element>

  <xs:element name="set">
    <xs:complexType>
      <xs:sequence>
	<!-- here I should declare an empty element -->
	<xs:element name="value" minOccurs="2" maxOccurs="unbounded">
	  <xs:complexType>
	    <xs:attribute ref="name"/>
	  </xs:complexType>
	</xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  
  <xs:element name="io">
    <xs:complexType>
      <xs:attribute ref="name"/>
    </xs:complexType>
  </xs:element>
  
  <xs:element name="factory">
    <xs:complexType>
      <xs:attribute ref="name"/>
    </xs:complexType>
  </xs:element>
  
  <xs:element name="option">
    <xs:complexType mixed="true" >
      <xs:choice minOccurs="0" maxOccurs="1">
	<xs:element ref="dict" />
	<xs:element ref="range" />
	<xs:element ref="set" />
	<xs:element ref="io" />
	<xs:element ref="factory" />
      </xs:choice>
      <xs:attribute ref="short"/>
      <xs:attribute ref="long" use="required"/>
      <xs:attribute ref="required" use="required"/>
      <xs:attribute ref="default" use="required"/>
      <xs:attribute ref="type" use="required"/>
    </xs:complexType>
  </xs:element>


  <xs:element name="param">
    <xs:complexType mixed="true">
      <xs:choice minOccurs="0" maxOccurs="1">
	<xs:element ref="dict"/>
	<xs:element ref="range"/>
	<xs:element ref="set"/>
	<xs:element ref="io"/>
	<xs:element ref="factory"/>
      </xs:choice>
      <xs:attribute ref="name" use="required"/>
      <xs:attribute ref="required" use="required"/>
      <xs:attribute ref="default" use="required"/>
      <xs:attribute ref="type" use="required"/>
    </xs:complexType>
  </xs:element>
  
  <xs:element name="group">
    <xs:complexType mixed="true">
      <xs:sequence>
	<xs:element ref="option" minOccurs="1" maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:attribute ref="name" />
    </xs:complexType>
  </xs:element>

  <xs:element name="plugin">
    <xs:complexType mixed="true">
      <xs:sequence>
	<xs:element ref="param" minOccurs="0" maxOccurs="unbounded"/>
	<xs:element name="noparam" minOccurs="0" maxOccurs="1"/>
	<xs:element name="suffixes" minOccurs="0" maxOccurs="1"/>
	<xs:element name="datatypes" minOccurs="0" maxOccurs="1"/>
      </xs:sequence>
      <xs:attribute ref="name" />
    </xs:complexType>
  </xs:element>

  <xs:element name="handler">
    <xs:complexType mixed="true">
      <xs:sequence>
	<xs:element ref="plugin" minOccurs="1" maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:attribute ref="name" />
    </xs:complexType>
  </xs:element>


  <xs:element name="Code" />
  
  <xs:element name="Example">
    <xs:complexType mixed="true">
      <xs:sequence>
	<xs:element ref="Code" minOccurs="1" maxOccurs="1"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  
  <xs:element name="program">
    <xs:complexType>
      <xs:sequence>
	<xs:element ref="name" minOccurs="1" maxOccurs="1"/> 
	<xs:element ref="section" minOccurs="1" maxOccurs="1"/> 
	<xs:element ref="description" minOccurs="1" maxOccurs="1"/> 
	<xs:element ref="basic_usage" minOccurs="1" maxOccurs="1"/> 
	<xs:element ref="whatis" minOccurs="1" maxOccurs="1"/> 
	<xs:element ref="group" minOccurs="1" maxOccurs="unbounded"/>
	<xs:element name="freeparams" minOccurs="0" maxOccurs="1">
	  <xs:complexType>
	    <xs:attribute ref="name" use="required"/>
	    <xs:attribute ref="type" use="required"/>
	  </xs:complexType>
	</xs:element>
	<xs:element ref="handler" minOccurs="0" maxOccurs="unbounded"/>
	<xs:element ref="Example" minOccurs="0" maxOccurs="unbounded"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  
</xs:schema>
