To use the simply type percent (xs:decimal), see the snippet below.
<xs:simpleType name="percent"> <xs:annotation> <xs:documentation>The percent type specifies a value from 0 to 100.</xs:documentation> </xs:annotation> <xs:restriction base="xs:decimal"> <xs:minInclusive value="0"/> <xs:maxInclusive value="100"/> </xs:restriction> </xs:simpleType>