Re: XML: How to require either or both of two child elements, but prevent both missing?

23 Feb 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@sendme.cz