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Galdos Systems, Inc. 2003. Developing and Managing GML Application Schemas. Vancouver, BC, Canada.

Galdos Systems Inc. Resources: a web page with links to many GML and XML Resources.

ISO 2004. Geographic Information - Geography Markup Language (GML) Version 3.1.

Lake, R., D.S. Burggraf, M. Trninic, and L. Rae 2004. Geography Mark-up Language (GML). John Wiley & Sons, Ltd. West Sussex, England.