How do I require that an element has either one set of attributes or another in an XSD schema?
- by Eli Courtwright
I'm working with an XML document where a tag must either have one set of attributes or another. For example, it needs to either look like <tag foo="hello" bar="kitty" /> or <tag spam="goodbye" eggs="world" /> e.g.
<root>
<tag foo="hello" bar="kitty" />
<tag spam="goodbye" eggs="world" />
</root>
So I have an XSD schema where I use the xs:choice element to choose between two different attribute groups:
<xsi:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema" attributeFormDefault="unqualified" elementFormDefault="qualified">
<xs:element name="root">
<xs:complexType>
<xs:sequence>
<xs:element maxOccurs="unbounded" name="tag">
<xs:choice>
<xs:complexType>
<xs:attribute name="foo" type="xs:string" use="required" />
<xs:attribute name="bar" type="xs:string" use="required" />
</xs:complexType>
<xs:complexType>
<xs:attribute name="spam" type="xs:string" use="required" />
<xs:attribute name="eggs" type="xs:string" use="required" />
</xs:complexType>
</xs:choice>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xsi:schema>
However, when using lxml to attempt to load this schema, I get the following error:
>>> from lxml import etree
>>> etree.XMLSchema( etree.parse("schema_choice.xsd") )
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "xmlschema.pxi", line 85, in lxml.etree.XMLSchema.__init__ (src/lxml/lxml.etree.c:118685)
lxml.etree.XMLSchemaParseError: Element '{http://www.w3.org/2001/XMLSchema}element': The content is not valid. Expected is (annotation?, ((simpleType | complexType)?, (unique | key | keyref)*))., line 7
Since the error is with the placement of my xs:choice element, I've tried putting it in different places, but no matter what I try, I can't seem to use it to define a tag to have either one set of attributes (foo and bar) or another (spam and eggs).
Is this even possible? And if so, then what is the correct syntax?
