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

     2 <xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">

     3   <xs:element name="levels">

     4     <xs:complexType>

     5       <xs:choice maxOccurs="unbounded" minOccurs="0">

     6         <xs:element name="block" maxOccurs="unbounded" minOccurs="0">

     7           <xs:complexType>

     8           	<xs:simpleContent>

     9           		<xs:extension base="xs:string">

    10           			<xs:attribute type="xs:string" name="name"

    11           				use="required" />

    12           			<xs:attribute type="xs:NMTOKEN" name="level"

    13           				use="optional" />

    14           			<xs:attribute type="xs:NMTOKENS" name="levels"

    15           				use="optional" />

    16           			<xs:attribute type="xs:int" name="span"

    17           				use="optional" />

    18           		</xs:extension>

    19           	</xs:simpleContent>

    20           </xs:complexType>

    21         </xs:element>

    22         <xs:element name="collection" maxOccurs="unbounded" minOccurs="0">

    23           <xs:complexType>

    24             <xs:simpleContent>

    25               <xs:extension base="xs:string">

    26                 <xs:attribute type="xs:string" name="name" use="required"/>

    27                 <xs:attribute type="xs:NMTOKEN" name="level" use="required"/>

    28               </xs:extension>

    29             </xs:simpleContent>

    30           </xs:complexType>

    31         </xs:element>

    32         <xs:element name="layer" maxOccurs="unbounded" minOccurs="0">

    33           <xs:complexType>

    34             <xs:simpleContent>

    35               <xs:extension base="xs:string">

    36                 <xs:attribute type="xs:string" name="name" use="required"/>

    37                 <xs:attribute type="xs:NMTOKENS" name="levels" use="optional"/>

    38                 <xs:attribute type="xs:int" name="span" use="optional"/>

    39               </xs:extension>

    40             </xs:simpleContent>

    41           </xs:complexType>

    42         </xs:element>

    43       </xs:choice>

    44     </xs:complexType>

    45   </xs:element>

    46 </xs:schema>