<xs:schema 
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns="http://www.w3.org/1998/Math/MathML"
  targetNamespace="http://www.w3.org/1998/Math/MathML"
  elementFormDefault="qualified"
 >

<xs:annotation>
  <xs:documentation>
  This is an XML Schema module for the logic operators of content MathML.
  Author: St&#233;phane Dalmas, INRIA.
  </xs:documentation>
</xs:annotation>

<!-- a common type for all this -->

<xs:complexType name="Logic.type">
  <xs:attributeGroup ref="Definition.attrib"/>
  <xs:attributeGroup ref="Common.attrib"/>
</xs:complexType>

<xs:element name="and" type="Elementary-functions.type"/>
<xs:element name="or" type="Logic.type"/>
<xs:element name="xor" type="Logic.type"/>

<xs:element name="not" type="Logic.type"/>

<xs:element name="exists" type="Logic.type"/>
<xs:element name="forall" type="Logic.type"/>

<xs:element name="implies" type="Logic.type"/>

<!-- And the group of everything -->

<xs:group name="Content-logic.class">
  <xs:choice>
    <xs:element ref="and"/>
    <xs:element ref="or"/>
    <xs:element ref="xor"/>
    <xs:element ref="not"/>
    <xs:element ref="exists"/>
    <xs:element ref="forall"/>
    <xs:element ref="implies"/>
  </xs:choice>
</xs:group>

</xs:schema>
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  Automatique, Keio University). All Rights Reserved. See
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