Geodata Discovery - Versionsgeschichte

Stefan: /* Part B Geotag Icon in HTML (OPTIONAL) */

2011-06-06T13:25:49Z

Part B Geotag Icon in HTML (OPTIONAL)

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	=== Part B Geotag Icon in HTML (OPTIONAL) ===		=== Part B Geotag Icon in HTML (OPTIONAL) ===

	Specifies the placement of a Geotag icon ([[Microformat]] ~~geo~~) in a HTML webpage. This is for human readability and trustworthiness as well as for general purpose webcrawlers (Google's principle of visual control) pointing to the syndication format (specified in Part A).		Specifies the placement of a Geotag icon ([[Microformat]] 'Geo') in a HTML webpage. This is for human readability and trustworthiness as well as for general purpose webcrawlers (Google's principle of visual control) pointing to the syndication format (specified in Part A).

	== Compliance ==		== Compliance ==

Stefan: /* References */

2011-06-06T13:25:36Z

References

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	* [http://www.w3.org/TR/xlink/ XML Linking Language (XLink) Version 1.0].		* [http://www.w3.org/TR/xlink/ XML Linking Language (XLink) Version 1.0].
	* [http://www.opensearch.org OpenSearch.org] > OpenSearch Geo extension (Draft) - A leightweight harvesting interface (Remarks: "rel='search'" notifes an application that here is a service that it can query to get at additional resources. Applies often also to webapplications capable which can be called with Permalinks).		* [http://www.opensearch.org OpenSearch.org] > OpenSearch Geo extension (Draft) - A leightweight harvesting interface (Remarks: "rel='search'" notifes an application that here is a service that it can query to get at additional resources. Applies often also to webapplications capable which can be called with Permalinks).
			* [http://microformats.org/wiki/geo Microformats.org 'Geo']
	* [[CSW]]		* [[CSW]]

Stefan: /* Part B Geotag Icon in HTML (OPTIONAL) */

2011-06-06T13:24:24Z

Part B Geotag Icon in HTML (OPTIONAL)

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	=== Part B Geotag Icon in HTML (OPTIONAL) ===		=== Part B Geotag Icon in HTML (OPTIONAL) ===

	Specifies the placement of a Geotag icon (Microformat) in a HTML webpage. This is for human readability and trustworthiness as well as for general purpose webcrawlers (Google's principle of visual control) pointing to the syndication format (specified in Part A).		Specifies the placement of a Geotag icon ([[Microformat]] geo) in a HTML webpage. This is for human readability and trustworthiness as well as for general purpose webcrawlers (Google's principle of visual control) pointing to the syndication format (specified in Part A).

	== Compliance ==		== Compliance ==

Stefan: /* Specification */

2011-06-06T13:20:37Z

Specification

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	== Specification ==		== Specification ==

	The Geodata Discovery standard consists of part (both are pure standards extensions, called substandards):		The Geodata Discovery standard consists of part A and B (both are pure standards extensions, called substandards):

	* Part A specifies extensions to the syndication formats GeoRSS and Atom as well as protocol extensions to OGCs Webservices.		* Part A specifies extensions to the syndication formats GeoRSS and Atom as well as protocol extensions to OGCs Webservices.
	* Part B specifies how to use an icon in HTML webpages.		* Part B specifies how to use an icon in HTML webpages inclunding GetTags (and eventually microformats).

	Syndication formats and protocols use xlinks to refer in a semantically clear way to geospatial webservices and geodata. These links provide semantics to help focussed crawlers to find OGC Services, like [[WMS]], [[WFS]], [[WCS]], [[WPS]] and/or [[CSW]].		Syndication formats and protocols use xlinks to refer in a semantically clear way to geospatial webservices and geodata. These links provide semantics to help focussed crawlers to find OGC Services, like [[WMS]], [[WFS]], [[WCS]], [[WPS]] and/or [[CSW]].

Stefan: /* Specification */

2010-04-21T00:09:36Z

Specification

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	<link rel="alternate" type="text/html"		<link rel="alternate" type="text/html"
	href="http://~~example~~.~~org~~/~~wms~~"/>		href="http://www.naturschutz.zh.ch/internet/bd/aln/ns/de/nsdaten/Geodaten/fns_wms.html"/>
	<link rel="alternate" type="application/vnd.google-earth.kml+xml"		<link rel="alternate" type="application/vnd.google-earth.kml+xml"
	href="http://example.org/kml_georss.kml"/>		href="http://example.org/kml_georss.kml"/>
			<link rel="alternate" type="text/xml"
			href="http://www.gis.zh.ch/scripts/wmsFNSSVO.asp"/>

	;Syndication extensions to OGC Web Services (protocol):		;Syndication extensions to OGC Web Services (protocol):

Stefan: /* Part A Syndication Format and Protocol Extensions (CONDITIONAL MANDATORY) */

2010-04-21T00:04:41Z

Part A Syndication Format and Protocol Extensions (CONDITIONAL MANDATORY)

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	* GeoRSS file format: Use of GeoRSS to syndicate KML content, similar to RSS support in HTML. See the [http://highearthorbit.com/a-proposal-georss-kml/ proposal] here.		* GeoRSS file format: Use of GeoRSS to syndicate KML content, similar to RSS support in HTML. See the [http://highearthorbit.com/a-proposal-georss-kml/ proposal] here.
	* Atom file format: rel and type attributes for (See IETF Web Linking Draft, chap. 6.2)		* Atom file format: rel and type attributes for (See IETF Web Linking Draft, chap. 6.2)

			<link rel="alternate" type="text/html"
			href="http://example.org/wms"/>
			<link rel="alternate" type="application/vnd.google-earth.kml+xml"
			href="http://example.org/kml_georss.kml"/>

	;Syndication extensions to OGC Web Services (protocol):		;Syndication extensions to OGC Web Services (protocol):

Stefan am 20. April 2010 um 23:52 Uhr

2010-04-20T23:52:29Z

Stefan: /* Specification */

2010-04-20T10:13:07Z

Specification

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	The Geodata Discovery standard consists of part A and B (both are pure standards extensions, called substandards):		The Geodata Discovery standard consists of part A and B (both are pure standards extensions, called substandards):

	* Part A specifies ~~two~~ syndication formats and protocol extensions to OGCs ~~WxS~~.		* Part A specifies extensions to the syndication formats GeoRSS and Atom as well as protocol extensions to OGCs Webservices.
	* Part B specifies how to use an icon in HTML webpages.		* Part B specifies how to use an icon in HTML webpages.

Stefan: /* Specification */

2010-04-20T10:12:07Z

Specification

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	The Geotag icon (i.e. its href HTML encoding) links back to the syndication formats and protocols.		The Geotag icon (i.e. its href HTML encoding) links back to the syndication formats and protocols.

	=== Part A Syndication (CONDITIONAL MANDATORY) ===		=== Part A Syndication Format and Protocol Extensions (CONDITIONAL MANDATORY) ===

	Specifies "See" and "See also" links (also called 'cross-links') in well known formats ("carrier formats") containing typified weblinks (whenever possible 'xlink' or "Atom link relation types").		Specifies "See" and "See also" links (also called 'cross-links') in well known formats ("carrier formats") containing typified weblinks (whenever possible 'xlink' or "Atom link relation types").

Stefan: /* Specification */

2010-04-20T10:11:16Z

Specification

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	== Specification ==		== Specification ==

	The Geodata Discovery standard consists of ~~following parts~~ A and B (both ~~in turn~~ are ~~based~~ standards extensions, called substandards):		The Geodata Discovery standard consists of part A and B (both are pure standards extensions, called substandards):

	* Part A specifies two syndication formats and protocol extensions to OGCs WxS ~~with specialized weblinks~~.		* Part A specifies two syndication formats and protocol extensions to OGCs WxS.
	* Part B specifies how to use an icon in HTML webpages ~~which~~ links to syndication formats and protocols.		* Part B specifies how to use an icon in HTML webpages.

			Syndication formats and protocols use xlinks to refer in a semantically clear way to geospatial webservices and geodata. These links provide semantics to help focussed crawlers to find OGC Services, like [[WMS]], [[WFS]], [[WCS]], [[WPS]] and/or [[CSW]].

			The Geotag icon (i.e. its href HTML encoding) links back to the syndication formats and protocols.

	=== Part A Syndication (CONDITIONAL MANDATORY) ===		=== Part A Syndication (CONDITIONAL MANDATORY) ===

	Specifies "See" and "See also" links (also called 'cross-links') in well known formats ("carrier formats") containing typified weblinks (whenever possible 'xlink' or "Atom link relation types") ~~which provide semantics to help focussed crawlers to find OGC Services, like [[WMS]], [[WFS]], [[WCS]], [[WPS]] and/or [[CSW]]~~.		Specifies "See" and "See also" links (also called 'cross-links') in well known formats ("carrier formats") containing typified weblinks (whenever possible 'xlink' or "Atom link relation types").

	;Syndication format extensions:		;Syndication format extensions:

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	The discovery of geodata and geospatial services is crucial of almost every project which involves geoprocessing and therefore also to every (geo) data infrastructure!		The discovery of geodata and geospatial services is crucial of almost every project which involves geoprocessing and therefore also to every (geo) data infrastructure!

	General purpose search engines are not capable of recognizing geodata formats and geospatial services. Thus, here is a ~~strong~~ need to support geospatial search services, especially repositories and webcrawlers. The solution is twofold: first help machines find explicitely resources they are looking for (through relation links) and, second, let users realize and control that they are browsing a web site which is enhanced with those machine readable relationships (through an icon).		General purpose search engines are not capable of recognizing geodata formats and geospatial services. Thus, here is a need to support geospatial search services, especially repositories and webcrawlers. The solution is twofold: first help machines find explicitely resources they are looking for (through relation links) and, second, let users realize and control that they are browsing a web site which is enhanced with those machine readable relationships (through an icon).

	Instead of a web of (HTML) documents, this is part of a vision about a web of services (and XML) which what (semantic) Web 2.0 is mostly about. "So it is vital at the GeoWeb align itself with the web and the multitude of sources and endpoints that the web is reaching into." (citation form High Earth Orbit blog).		Instead of a web of (HTML) documents, this is part of a vision about a web of services (and XML) which what (semantic) Web 2.0 is mostly about. "So it is vital at the GeoWeb align itself with the web and the multitude of sources and endpoints that the web is reaching into." (citation form High Earth Orbit blog).
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	=== Relationship to other standards ===		=== Relationship to other standards ===

	This specification doesn't require any change to ~~any of~~ the formats and standards mentioned. In fact, it's ~~just~~ a recommendation for a common usage of these formats.		This specification doesn't require any change to the formats and standards mentioned except for OGC's WxS where it's an add-on. In fact, it's mostly a recommendation for a common usage of these formats.

	robots.txt and sitemaps.xml from Google are somehow similar because ~~the~~ refer to contents. The harvesting protocol [[OAI-PMH]] includes also a "See also" element. Beyond this there is no similar standard for discovery known to us.		robots.txt and sitemaps.xml from Google are somehow similar because they refer to (forbidden) contents. The harvesting protocol [[OAI-PMH]] includes also a "See also" element. Beyond this there is no similar standard for discovery known to us.

	== Specification ==		== Specification ==

	The Geodata Discovery standard consists of part ~~A and B~~ (both are pure standards extensions, called substandards):		The Geodata Discovery standard consists of part (both are pure standards extensions, called substandards):

	* Part A specifies extensions to the syndication formats GeoRSS and Atom as well as protocol extensions to OGCs Webservices.		* Part A specifies extensions to the syndication formats GeoRSS and Atom as well as protocol extensions to OGCs Webservices.
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	;Syndication format extensions:		;Syndication format extensions:
	* GeoRSS file format: Use of GeoRSS to syndicate KML content, similar to RSS support in HTML.. See the [http://highearthorbit.com/a-proposal-georss-kml/ proposal] here.		* GeoRSS file format: Use of GeoRSS to syndicate KML content, similar to RSS support in HTML. See the [http://highearthorbit.com/a-proposal-georss-kml/ proposal] here.
	* Atom file format: rel and type attributes for (See IETF Web Linking Draft, chap. 6.2)		* Atom file format: rel and type attributes for (See IETF Web Linking Draft, chap. 6.2)

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	Extensions of GetCapabilities request with xlink tags ... (tbd.)!		Extensions of GetCapabilities request with xlink tags ... (tbd.)!

	'CONDITIONAL MANDATORY' means that at least one of the ~~thre~~ mentioned substandards needs to implemented in order to comply to the "Geodata Discovery" standard.		'CONDITIONAL MANDATORY' means that at least one of the mentioned substandards needs to implemented in order to comply to the "Geodata Discovery" standard.

	=== Part B Geotag Icon in HTML (OPTIONAL) ===		=== Part B Geotag Icon in HTML (OPTIONAL) ===
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	Specifies the placement of a Geotag icon (Microformat) in a HTML webpage. This is for human readability and trustworthiness as well as for general purpose webcrawlers (Google's principle of visual control) pointing to the syndication format (specified in Part A).		Specifies the placement of a Geotag icon (Microformat) in a HTML webpage. This is for human readability and trustworthiness as well as for general purpose webcrawlers (Google's principle of visual control) pointing to the syndication format (specified in Part A).

	== Compliance ~~Tests~~ ==		== Compliance ==

	tbd. Ideally there should be a website which lists conformances tests given a website which was enhanced according to this specifications.		tbd. Ideally there should be a website which lists conformances tests given a website which was enhanced according to this specifications.