Annotation to version attribute (#794)

* Annotation to version attribute

* Update xsd/netex_framework/netex_responsibility/netex_version_support.xsd

Improved...

xsd/netex_framework/netex_responsibility/netex_version_support.xsd

@@ -186,7 +186,7 @@ Rail transport, Roads and Road transport
 		</xsd:attribute>
 		<xsd:attribute name="version" type="VersionIdType" use="optional">
 			<xsd:annotation>
-				<xsd:documentation>Version number of entity.</xsd:documentation>
+				<xsd:documentation>Version number of entity. The value may be "any" or a VERSION number adhering to agreed-upon formatting and interpretation rules (representing, e.g., a number or a date). Consecutive VERSION numbers should be strictly increasing.</xsd:documentation>
 			</xsd:annotation>
 		</xsd:attribute>
 		<xsd:attribute name="status" type="StatusEnumeration" use="optional" default="active">