<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.csc.liv.ac.uk/~molyneux/XML-WDB" xmlns="http://www.csc.liv.ac.uk/~molyneux/XML-WDB" elementFormDefault="qualified" attributeFormDefault="unqualified">

<xsd:complexType name="system_of_set_equations">
   <xsd:sequence minOccurs="0" maxOccurs="unbounded">
     <xsd:element name="eqn" type="set_equation"/>
   </xsd:sequence>
</xsd:complexType>

<xsd:complexType name="set_equation">
   <xsd:sequence minOccurs="0" maxOccurs="unbounded">
     <xsd:any namespace="##any" processContents="lax"/>
   </xsd:sequence>
   <xsd:attribute form="qualified" name="id" type="xsd:ID" use="required"/>
</xsd:complexType>

<xsd:element name="eqns" type="system_of_set_equations"/>

</xsd:schema>