2.5.1.2 versionType
The versionType specifies a string representing a version number. The version number has one of the following formats: "X.Y", "X.Y.Z", or "X.Y.Z.W", where X, Y, Z, and W contain one or more decimal digits.
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<xs:simpleType name="versionType"> <xs:restriction base="xs:string"> <xs:pattern value="\d+(\.\d+){1,3}"/> </xs:restriction> </xs:simpleType>