If you are interested in open standards in the geospatial community, the following site should be added to your link repository:

http://www.opengeospatial.org/

You can download the OpenGIS standards which abstract many attributes, properties and concepts of geospatial, sensor, and GIS ‘XML’ formats at: 

http://schemas.opengis.net/

Viewing the available demonstrations introduces you to a number of abstract concepts such as the RPC Sensor Model.  For example:

http://www.opengeospatial.org/resource/demos

Interoperability among GIS systems is a major objective of the OpenGIS.  The ERDAS Apollo product illustrates the utility of the use of OpenGIS standards.

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