| <?xml version="1.0" encoding="UTF-8" ?> |
| <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> |
| <xs:simpleType name="pattern_type"> |
| <xs:restriction base="xs:string"> |
| <xs:pattern value="CUSTOM_[0-9a-zA-Z]+" /> |
| </xs:restriction> |
| </xs:simpleType> |
| |
| <xs:simpleType name="enum_type"> |
| <xs:restriction base="xs:string"> |
| <xs:enumeration value="KEY1" /> |
| <xs:enumeration value="KEY2" /> |
| <!-- Note: *no* matching entry for key "CUSTOM_KEY1" --> |
| </xs:restriction> |
| </xs:simpleType> |
| |
| <xs:simpleType name="union_type"> |
| <xs:union memberTypes="enum_type pattern_type" /> |
| </xs:simpleType> |
| |
| <xs:element name="root"> |
| <xs:complexType> |
| <xs:sequence> |
| <xs:element name="item" maxOccurs="unbounded"> |
| <xs:complexType> |
| <xs:attribute name="key" type="union_type" use="required" /> |
| </xs:complexType> |
| </xs:element> |
| </xs:sequence> |
| </xs:complexType> |
| <xs:key name="primary_key"> |
| <xs:selector xpath="./item" /> |
| <xs:field xpath="@key" /> |
| </xs:key> |
| </xs:element> |
| </xs:schema> |