Appendix E: Revision History

REC-GML2 (Recommendation, 2001-02-20):

  • extensive restructuring of content

  • fixed usage of 'type' attribute in xlinks utility schema

  • the XLink schema is now normative

  • feature collections can now be empty (per OGC Abstract Specification)

  • renamed FeatureMemberType and GeometryMemberType to FeatureAssociationType and GeometryAssociationType, respectively

  • updated UML diagrams

  • added UML diagrams for the 'Cambridge' and 'Schools' examples

  • expanded discussion about profiles and application frameworks (sec. 7)

PR-GML2 (Proposed Recommendation, 2001-01-15):

  • Moved discussion of XLink attributes to section 4.4 and deleted the GeoLinks schema

  • Removed material on temporal data (sec. 6) to a separate GML Module

  • purged RDF remnants

  • changed the names of identifying attributes ('fid' for features, 'gid' for geometry elements)

  • added gml:AssociationType to support pointers to remote feature properties

  • miscellaneous editorial changes

CR-GML2 (Candidate Recommendation, 2000-12-22):

  • changed srsName attribute to type="uriReference"

  • the featureMember element and all basic geometric properties can also function as pointers to remote resources (i.e. as simple-type XLink elements)

  • added a brief introduction to section 5 that clarifies the different ways GML can be used to express associations (i.e. containment vs. linking)

  • added an example to section 5.4 demonstrating the use of a linkbase to store instances of feature relationships (Listings 5.7 - 5.9)

  • inserted comments concerning feature identification (sec. 4.2)

  • miscellaneous corrections: invalid feature identifiers; invalid xlink:role attributes

  • coordinate strings may now contain 1D, 2D, or 3D tuples

  • added a description of the Feature Filter design pattern (sec. 4.4.6)

  • removed the gml:label attribute from the GeoLinks schema



     
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