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SESSION METADATA AND CATALOGUES Schema translation Establishing, documenting and publishing a vocabulary by means of an application schema is an important step. Still, it should be clear that there will be a more or less complex gap between the internal schema of an application and the published schema that needs to be bridged. Since re-engineering of the applications to align the internal schema with the published schema is usually not an option, because it would be too expensive or simply inappropriate, technologies providing such a bridge are required. To describe such a capability, the term of a translating Web Feature Service (WFS-X) has been coined by OGC. A WFS-X enables the providers of content to configure a mapping from a published to an internal schema. The emphasis here is on configuration instead of hardcoding the mapping in software. This approach has, for example, been explored in several OGC initiatives [6, 7] using different technologies to describe the mapping including XSLT- and XQuery-based approaches. Interactive instruments has developed rules for a mapping from a GML Application Schema to SQL databases and implemented these rules in their XtraServer product. The mapping rules are specified as part of the GML Application Schema documents in XML Schema annotations, or in a separate configuration file, and is based on Xpath expressions. The mapping allows to encode rather complex mappings from the published schema to the internal database schema. The mapping takes into account: � the encoding of the database contents in XML (GML) according to the published application schema and vice versa; � an efficient encoding of queries that were formulated on the information model of the published application schema as SQL queries acting on the internal database schema. The paper will describe the approach, provide examples and discuss limits of such approaches based on our experiences. The technologies discussed in this paper are a promising approach to leverage existing datasets into the emerging infrastructures for geospatial services and data. In particular the topic of automatic translation between different schemas will require further research – and testing using real-world test cases from different application domains. References: [1] ISO/TS 19103 (http://www.iso.ch/) [2] ISO 19109 (http://www.iso.ch/) [3] GML 3.2.0 = ISO/DIS 19136 (http://www.iso.ch/) [4] ShapeChange (UML to GML Application Schema conversion tool, http://www.interactiveinstruments.de/ShapeChange) [5] OWS-2 Application Schema Development (http://portal.opengeospatial.org/files/?artifact_id=8071) [6] OGC CIPI 1.2 initiative (http://www.opengeospatial.org/initiatives/?iid=64) [7] OGC GOS-TP initiative (http://www.opengeospatial.org/initiatives/?iid=8) [8] GeoInfoDok of the German AFIS-ALKIS-ATKIS project (http://www.adv-online.de/exteng/broker.jsp?uMen=01a700d3-6ed6-0bfb-8f23-50376a112976) [9] OWS-3 Schema Tailoring and Maintenance (to be published as an OGC Discussion Paper) [10] OGC Catalogue Services – ebRIM (ISO/TS 15000-3) profile of CSW (http://portal.opengeospatial.org/files/?artifact_id=7048) 28
SESSION METADATA AND CATALOGUES STYLEDCAT: Definition of a SLD Catalogue A.Maldonado, M.A.Bernabé, M.A.Manso, M.C.Muñoz, M.Manrique Department of Topography and Cartographic Engineering, Universidad Politécnica de Madrid(UPM), Madrid, Spain 1 amaldonado@topografia.upm.es , 2 ma.bernabe@upm.es 3 m.manso@upm.es, mmunoz@topografia.upm.es5 maytemanrique@upm.es Introduction The vector information shown by a WMS usually appears as a set of points, lines and texts with a standard style not conformant to any regulation. This standard style does not hold the graphic characteristics intended to improve geographic information visualization, contrary to what happens with maps. In order to enhance visualization and facilitate the classification of the features contained in maps, styles may be applied to map elements, so that they will be more easily distinguishable. The Open Geospatial Consortium (OGC) describes in one of its specifications a language called Styled Layer Descriptor (SLD), enabling graphic styling of visualization (colour, weight, typology, etc) to maps returned from requests made to map servers. With this specification, it will be possible for maps obtained from a WMS to have the appearance of traditional, paper maps produced by any cartographic service; it will just be necessary to have the style corresponding to the symbology that service is applying to its maps. This paper deals with the creation of a repository for storage of the style parameters to be designed, conformant to one or several cartographic series of one or several agencies, so that users will be able to apply the vector data visualized by a WMS, thereby generating cartography with an aspect similar to the one the particular agency uses as an organization. Any of the parameters stored in the repository (colours, weights, sizes, etc.) could be applied to the different geographic features (roads, rivers, contour lines) which will be hierarchically defined (highway, road, path) by the cartographic service on the basis of the feature attributes. This hierarchical structuring will be carried out through the application of selective filters to attribute values, as allowed by the SLD Specification. Every specification corresponding to the agencies’ styles is stored in a database where the repository is actually realized. This repository replies to the requests it receives by acting as a catalogue to search and download styles thereon. The repository should be harmonized (GetCapabilities, GetStyle) with the remainder of OGC Specifications. We are mainly concerned with the definition of a repository for storage of the feature customized styles with interaction capability for insertion, deletion and update by user’s choice. Since the main task of this catalogue service is obtaining maps from requests to WMS, when downloading of a particular style is requested, the predetermined output format will be the SLD format, though a SVG or even a text format could also be requested. Rationale for this project Since maps are valuable tools for decision-making and since adequately categorized, generalized, laid out graphic information facilitates decision-making, it is advisable for the information to be visualized in as legible a form as possible. This is achieved by implementing on the vector information the graphic semiotics governing cartographic communication. Mapping agencies do it by applying styles to the information being presented on their maps (roads and constructions in red, railways in black) and providing information about the importance of features by means of different visualization sizes (line weights, text size). Map reading and understanding may be hindered by the lack of these regulated styles. Although the SLD Specification is currently operative and can be applied to information from a WMS, we run into difficulties of application by users (it is described through XML!) and the visual quality of resultant maps is not ensured. Therefore, a collection of available, easily applicable, styles is needed. Thus work on this project is reasonable in view of two facts as mentioned above and presented as follows: 1. Lack of a symbolization normalized style catalogue at the present time. 29
Page 1 and 2: The mission of the JRC is to provid
Page 3 and 4: Table of Contents MISSION STATEMENT
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SESSION: DATA SHARING Eliminating O
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European Commission EUR 22318 DG Jo
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