simpleType booleanOrNull

namespace	http://www.opengis.net/gml
type	union of (gml:NullEnumeration, xs:boolean, xs:anyURI)
used by	simpleType  booleanOrNullList
annotation	documentation Union of the XML Schema boolean type and the GML Nulltype.  An element which uses this type may have content which is either a boolean {0,1,true,false} or a value from Nulltype
source	<xs:simpleType name="booleanOrNull">   <xs:annotation>     <xs:documentation>Union of the XML Schema boolean type and the GML Nulltype.  An element which uses this type may have content which is either a boolean {0,1,true,false} or a value from Nulltype</xs:documentation>   </xs:annotation>   <xs:union memberTypes="gml:NullEnumeration boolean anyURI"/> </xs:simpleType>

XML Schema documentation generated by XMLSpy Schema Editor http://www.altova.com/xmlspy