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Location Object and GML Issues

Explore the usage of GML in Geopriv, including the generation of a GML application schema or a GML profile to align with Geopriv requirements. Discuss the importance of finishing work on Location Object and provide insights into the implementation experience.

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Location Object and GML Issues

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  1. H. Tschofenig C. Guenther Location Object and GML Issues

  2. Use of GML in Geopriv • GML consists of a set of XML schemas (http://schemas.opengis.net/gml/) and the proper GML specification (http://www.opengis.org/docs/02-023r4.pdf). • GML = Geography Markup Language • Series of XML schemas for describing geographic data, http://schemas.opengis.net/gml/. • Current version: 3.0:http://www.opengis.org/docs/02-023r4.pdf. (there are 3.0.1 versions of the GML schemas). • Developed by: OpenGIS Consortium (OGC), http://www.opengis.org, industry consortium consisting of 258 companies, government agencies and universities.

  3. geometryBasic2d.xsd temporal.xsd What does it mean to use GML? feature.xsd geometryBasic0d1d.xsd measure.xsd gmlBase.xsd dictionary.xsd units.xsd basicTypes.xsd xLinks.xsd

  4. Problem • Some additional details on the usage of GML for Geopriv is required. • For Geopriv we do not need many of the feature.xsd elements. • GML v3 does not include Civil Location.

  5. Approach 1: Generate a GML application • A GML application schema is an XML schema that uses the type and element definitions of a GML profile as a basis and includes or extends them in new type and element definitions. (see Chapter 8) • Similar to the approach currently taken (i.e., import feature.xsd). • Following the guidance provided by GML allows better alignment with Geopriv.

  6. Approach 2: Generate a GML profile • A GML profile consists of XML schemas that are defined in such a way that XML instance documents valid against the profile schemas are also valid against the full set of GML schemas (chapter 7.16). • A GML profile defines XML types and elements that are consistent with the complete GML set of schemas, but potentially restricts the complete GML vocabulary and syntax. • Geopriv could define a GML profile suitable for its needs.

  7. Conclusions and Next Steps • No doubts: GML is certainly powerful and suitable for Geopriv. • Constraints: Work on Location Object needs to be finished soon. • Goal: • We need to describe in more detail what it means to say "Use GML feature.xsd." • Implementation experience will provide additional insights.

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