The development of the Internet has changed the environment for Geographical Information Systems (GIS), with the emphasis shifting from analysis to the sharing of data and information over the Internet thus making GIS more mobile and powerful. The Geography Mark--Up Language (GML) was developed as the standard language and is emerging as the foundation for Internet GIS. Geography Mark--Up Language: Foundation for the Geo--Web provides a broad coverage of the use of GML in different application areas, along with the technical means for building these applications. Starting from the basic concepts, this book works through all the important topics in both GML 2.0 and GML 3.0, with illustrations and worked examples to demonstrate its use. Organized into two sections, Volume I introduces readers to the new world of GML, and explains how it can be used across a broad range of GIS projects. It deals with the basic concepts of XML and GML, and enables readers to make decisions on the utility of GML in their projects and software acquisitions. Volume II is intended for the technical reader and answers questions on the meaning and structure of GML schema components, the development of GML application schemas, and the use of GML in connection with web services, legacy GIS and relational databases.* Contains worked examples* Covers all aspects of GML 3.0 from geometry and topology to units of measure, default styling and coverages* Explains the Geo--Web and its impact on vertical applications* Authored by leading figures in GML development This book is a must have for GIS vendors, system integrators and data providers; local/state/provincial and national government agencies; utilities and telecommunication companies; location--based services companies; data distributors; software developers and technical managers. It would make an excellent reference for mid and upper--level undergraduate students and Masters students taking technical GIS modules as part of a GIS or Technical Geography programmes.