inputFormat

               This inputFormat attribute is used to indicate 
               the format used to encode a feature instance in
               an Insert element.  The default value of
               'text/xml; subtype=gml/3.1.1' is used to indicate
               that feature encoding is GML3.  Another example
               might be 'text/xml; subtype=gml/2.1.2' indicating
               that the feature us encoded in GML2.  A WFS must
               declare in the capabilities document, using a 
               Parameter element, which version of GML it supports.