1 <?xml version="1.0" encoding="UTF-8"?>

     2 <xsd:schema targetNamespace="http://www.example.eclipse.org/Library"

     3     xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore"

     4     xmlns:lib="http://www.example.eclipse.org/Library"

     5     xmlns:xsd="http://www.w3.org/2001/XMLSchema">

     6   <xsd:complexType name="Book">

     7     <xsd:sequence>

     8       <xsd:element name="title" type="xsd:string"/>

     9       <xsd:element name="pages" type="xsd:int"/>

    10       <xsd:element name="category" type="lib:BookCategory"/>

    11       <xsd:element name="author" type="xsd:anyURI"

    12           ecore:reference="lib:Writer" ecore:opposite="books"/>

    13     </xsd:sequence>

    14   </xsd:complexType>

    15   <xsd:complexType name="Writer">

    16     <xsd:sequence>

    17       <xsd:element name="name" type="xsd:string"/>

    18       <xsd:element maxOccurs="unbounded" minOccurs="0" name="books"

    19           type="xsd:anyURI" ecore:reference="lib:Book" ecore:opposite="author"/>

    20     </xsd:sequence>

    21   </xsd:complexType>

    22   <xsd:complexType name="Library">

    23     <xsd:sequence>

    24       <xsd:element name="name" type="xsd:string"/>

    25       <xsd:element maxOccurs="unbounded" minOccurs="0"

    26           name="writers" type="lib:Writer"/>

    27       <xsd:element maxOccurs="unbounded" minOccurs="0"

    28           name="books" type="lib:Book"/>

    29     </xsd:sequence>

    30   </xsd:complexType>

    31   <xsd:simpleType name="BookCategory">

    32     <xsd:restriction base="xsd:NCName">

    33       <xsd:enumeration value="Mystery"/>

    34       <xsd:enumeration value="ScienceFiction"/>

    35       <xsd:enumeration value="Biography"/>

    36     </xsd:restriction>

    37   </xsd:simpleType>

    38 </xsd:schema>