You cannot achieve this in XSD 1.0; you have to either move to XSD 1.1 (the only freely available processor that I know of is Xerces, and that is in beta status) OR augment your XSD 1.0 model with Schematron (the latter being XSLT 1.0/2.0 based, you have options galore).
I have this xsd
<xs:attributeGroup name="PropertyAttributes"> <xs:attribute name="IsAttached" type="xs:boolean" default="false" /> <xs:attribute name="IsStatic" type="xs:boolean" default="false" /> </xs:attributeGroup>
I like to restrict this case IsAttached=true IsStatic=true
How can I do this?