XSD: if an element has a specific meaning, the other should be optional
I have an XML document similar to:
<?xml version="1.0" encoding="UTF-8"?>
<html2filename xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../xsd/mapper.xsd">
<htmlFile filename="N5670A">
<variant>1</variant>
<groups>
<group>
<name>Removing thermostat</name>
</group>
<someOtherElements>asdasd</someOtherElements>
</groups>
</htmlFile>
</html2filename>
Now the element "groups" → "group" → "name" → must have one restriction: it must be optional if "variant" is 3. If not, it must be necessary.
Can XSD handle this? If so, how?
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1 answer
XSD 1.1
An xs:assert
can implement such a value-sensitive constraint:
<xs:assert test="(variant = 3) or groups/group/name"/>
Here's in the context of a complete XSD that will validate the provided XML:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:vc="http://www.w3.org/2007/XMLSchema-versioning"
vc:minVersion="1.1">
<xs:element name="html2filename">
<xs:complexType>
<xs:sequence>
<xs:element name="htmlFile">
<xs:complexType>
<xs:sequence>
<xs:element name="variant"/>
<xs:element name="groups">
<xs:complexType>
<xs:sequence>
<xs:element name="group" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" minOccurs="0"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="someOtherElements"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="filename"/>
<xs:assert test="(variant = 3) or groups/group/name"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
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