XML: How to require either or both of two child elements, but prevent both missing?
Pavel Benda
pavelben at SENDME.CZ
Sun Feb 23 11:49:26 CET 2003
Hi all,
I suppose William Ullate is right way; nevertheless, his example isn't
completed and doesn't work.
The correct syntax of William code is here:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:element name="Parent">
<xs:complexType>
<xs:choice>
<xs:group ref="elementAoptB"/>
<xs:element ref="elementB" minOccurs="1"/>
</xs:choice>
</xs:complexType>
</xs:element>
<xs:group name="elementAoptB">
<xs:sequence>
<xs:element name="elementA" minOccurs="1"/>
<xs:element ref="elementB" minOccurs="0"/>
</xs:sequence>
</xs:group>
<xs:element name="elementB"/>
</xs:schema>
This work fine.
Pavel Benda
Czech Collection of Microorganisms
pavelben at sendme.cz
More information about the tdwg-content
mailing list