Add annotations for Min/Max/Pattern

Start a "Validation" vocabulary with the following: <Schema xmlns="http://docs.oasis-open.org/odata/ns/edm" Namespace="Validation.1.0.0"> <Term Name="Pattern" Type="Edm.String"> <Annotation Term="OData.Description" String="The pattern that a string property or parameter must match."/> </Term> <Term Name="Minimum" Type="Edm.Decimal"> <Annotation Term="OData.Description" String="Minimum value that a numeric property or parameter can have."/> </Term> <Term Name="Maximum" Type="Edm.Decimal"> <Annotation Term="OData.Description" String="Maximum value that a numeric property or parameter can have."/> </Term> </Schema> plus new term, "Validation.Exclusive", that can be applied to Validation.Minimum and Validataion.Maximum..