OGC Seeks Comments on "NIL Extension" to Geography Markup Language (GML)

Please note: This Request is closed. The documents listed below have been adopted by the OGC Technical and Planning Committee. These specifications are under control of the Standards Working Group and will be released after the edits and revisions. For the most current version please check our Standards Page.
Closing Date: 
Friday, 23 November 2012 05:00 UTC

The Open Geospatial Consortium (OGC®) seeks public comment on the candidate "GML-NIL profile" of the OGC Geography Markup Language (GML) Encoding standard. GML is a widely used XML grammar for encoding information about geographical features. The GML-NIL profile provides a way to allow data providers to make a best effort to supply data according to an application schema, even if they do not have values for all feature properties. This is achieved by marking the application schema as a whole as ‘nillable=true’ and using OGC ‘nil’ URIs in links for missing data. This reverses the usual pattern which has a default value of nillable=false.   


The GML-NIL pattern of use has been used informally for several years in Earth and environmental science applications, and this candidate standard merely aims to formalize and document the practice. It is expected to be useful in many applications where a heterogeneous community wishes to enable participation by a wide variety of members with different capabilities and data sources. The submission team is composed of members of the GeoSciML project.


The candidate OGC GML-NIL standard documents are available for review and comment below.


 Nillable GML (12-110)   



Comments can be submitted to a dedicated email reflector for a thirty day period ending on the "Close request date" listed above, Comments received will be consolidated and reviewed by OGC members for incorporation into the document. Please submit your comments using the following link: requests [at] lists.opengeospatial.org (Click here to submit comments) The link provided above should include a standard template in the message body. If the preloaded message body does not work properly using your mail client, please refer to the following template for the message body: Comments Template


 You may wish to be added to the distribution list to receive comments as they are submitted:

Subscribing to the the list will also allow you to view comments already received, which can be found in the List Archives.