BaseMaps.xsd

<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="BaseMaps" type="BaseMapsType"/>
  
  <!-- Metadata is just a standard type with key/value paris-->
  <xs:complexType name="MetaType">
    <xs:simpleContent>
      <xs:extension base="xs:string">
        <xs:attribute type="xs:string" name="name" use="required"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name="MetadataType">
    <xs:sequence>
      <xs:element type="MetaType" name="Meta"/>
    </xs:sequence>
  </xs:complexType>


  <xs:simpleType name="lyrTilesType">
    <xs:restriction base="xs:string">
      <xs:enumeration value="wms" />
      <xs:enumeration value="tms" />
      <xs:enumeration value="xyz" />
    </xs:restriction>
  </xs:simpleType>
  

  <!-- Layers have a few attributes and contain metadata -->
  <xs:complexType name="LayerType">
    <xs:sequence>
      <xs:element type="MetadataType" name="Metadata"/>
    </xs:sequence>
    <xs:attribute type="xs:string" name="name" use="required"/>
    <xs:attribute type="lyrTilesType" name="type" use="required"/>
    <xs:attribute type="xs:string" name="url" use="required"/>
  </xs:complexType>

  <!-- Groups contain layers -->
  <xs:complexType name="GroupLayerType">
    <xs:sequence>
      <xs:element type="LayerType" name="Layer" maxOccurs="unbounded" minOccurs="0"/>
    </xs:sequence>
    <xs:attribute type="xs:string" name="name" use="required"/>
  </xs:complexType>

  <!-- Regions contain Groups -->
  <xs:complexType name="RegionType">
    <xs:sequence>
      <xs:element type="GroupLayerType" name="GroupLayer" maxOccurs="unbounded" minOccurs="0"/>
    </xs:sequence>
    <xs:attribute type="xs:string" name="name"/>
  </xs:complexType>

  <!-- Basemaps contain Regions -->
  <xs:complexType name="BaseMapsType">
    <xs:sequence>
      <xs:element type="RegionType" name="Region"/>
    </xs:sequence>
  </xs:complexType>
</xs:schema>