I am trying to write a schema that will validate an XML document with the following structure:
<?xml version="1.0" encoding="UTF-8"?>
<RootElement>
<Group1>
<Group1Member1 value="true"/>
<Group1Member2 value="false"/>
<Group1Member3 value="true"/>
</Group1>
<Group2>
<Group2Member1 source="INA"/>
<Group2Member2 source="INB"/>
<Group2Member3 source="INC"/>
<Group2Member4 source="IND"/>
</Group2>
<Group3>
<Group3Member1 source="INY"/>
<Group3Member2 source="INZ"/>
</Group3>
<Group4>
<Group4Member device="D1" maxTemp="100" hysteresis="5" />
<Group4Member device="D2" maxTemp="120" hysteresis="2" />
<Group4Member device="D3" maxTemp="50" hysteresis="1" />
</Group4>
<RootElement>
The catch is that:
- Group1, Group2, Group3, and Group4 are optional and may occur 0 or one times in any order
- The member elements of each group may occur in any order
- Within Group4, Group4Member may appear between 0 and 4 times, inclusive
- Any number of arbitrary elements not shown here may appear anywhere within RootElement or any of the groups -- they and anything in their bodies are to be ignored
- Unknown attributes within any known element must be ignored
I have put together the following XSD:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:element name="RootElement">
<xs:complexType>
<xs:all>
<xs:element name="Group1" maxOccurs="1">
<xs:complexType>
<xs:all>
<xs:element name="Group1Member1" maxOccurs="1">
<xs:complexType>
<xs:attribute name="value" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="true" />
<xs:enumeration value="false" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
</xs:element>
<xs:element name="Group1Member2" maxOccurs="1">
<xs:complexType>
<xs:attribute name="value" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="true" />
<xs:enumeration value="false" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
</xs:element>
<xs:element name="Group1Member3" maxOccurs="1">
<xs:complexType>
<xs:attribute name="value" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="true" />
<xs:enumeration value="false" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
</xs:element>
</xs:all>
</xs:complexType>
</xs:element>
<xs:element name="Group2" maxOccurs="1">
<xs:complexType>
<xs:all>
<xs:element name="Group2Member1" maxOccurs="1">
<xs:complexType>
<xs:attribute name="source" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="INA" />
<xs:enumeration value="INB" />
<xs:enumeration value="INC" />
<xs:enumeration value="IND" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
</xs:element>
<xs:element name="Group2Member2" maxOccurs="1">
<xs:complexType>
<xs:attribute name="source" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="INA" />
<xs:enumeration value="INB" />
<xs:enumeration value="INC" />
<xs:enumeration value="IND" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
</xs:element>
<xs:element name="Group2Member3" maxOccurs="1">
<xs:complexType>
<xs:attribute name="source" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="INA" />
<xs:enumeration value="INB" />
<xs:enumeration value="INC" />
<xs:enumeration value="IND" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
</xs:element>
<xs:element name="Group2Member4" maxOccurs="1">
<xs:complexType>
<xs:attribute name="source" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="INA" />
<xs:enumeration value="INB" />
<xs:enumeration value="INC" />
<xs:enumeration value="IND" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
</xs:element>
</xs:all>
</xs:complexType>
</xs:element>
<xs:element name="Group3" maxOccurs="1">
<xs:complexType>
<xs:all>
<xs:element name="Group3Member1" maxOccurs="1">
<xs:complexType>
<xs:attribute name="source" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="INY" />
<xs:enumeration value="INZ" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
</xs:element>
<xs:element name="Group3Member2" maxOccurs="1">
<xs:complexType>
<xs:attribute name="source" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="INY" />
<xs:enumeration value="INZ" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
</xs:element>
</xs:all>
</xs:complexType>
</xs:element>
<xs:element name="Group4" maxOccurs="1">
<xs:complexType>
<xs:sequence>
<xs:element name="Group4Member" maxOccurs="4">
<xs:complexType>
<xs:attribute name="device" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="D1" />
<xs:enumeration value="D2" />
<xs:enumeration value="D3" />
<xs:enumeration value="D4" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="maxTemp" use="required">
<xs:simpleType>
<xs:restriction base="xs:integer">
<xs:minInclusive value="0" />
<xs:maxInclusive value="255" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="hysteresis" use="required">
<xs:simpleType>
<xs:restriction base="xs:integer">
<xs:minInclusive value="0" />
<xs:maxInclusive value="255" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:all>
</xs:complexType>
</xs:element>
</xs:schema>
"xmllint" is happy with a document that has no unknown tags or attributes.
When I add "<xs:any processContents="skip" minOccurs="0">" just before the "</xs:sequence>" and "</xs:all>" tags, the schema no longer flags extra (beyond 4) or invalid (bad attribute value) "<Group4Member>" elements as errors.
I'm probably doing something stupid, and there's a chance that someone can pinpoint my problem easily, so I'm asking here.
I've not yet tried the anyAttribute on this, I figure I'll get there eventually. Also, is there any way to have "<xs:all>" groups allow 0 or more (not 0 or 1) occurrences of any member element?
Thanks for your patience, and in advance for any help.
