GeoRSS

GeoRSS is an emerging standard for encoding location as part of an Web feed. (Web feeds are used to describe feeds ("channels") of content, such as news articles, Audio blogs, video blogs and text blog entries. These web feeds are rendered by programs such as aggregators and web browsers.) The name "GeoRSS" is derivated from RSS, the most known Web feed and syndication format.

In GeoRSS, location content consists of geographical points, lines, and polygons of interest and related feature descriptions. GeoRSS feeds are designed to be consumed by geographic software such as map generators. By building these encodings on a common information model, the GeoRSS collaboration is promoting interoperability and "upwards-compatibility" across encodings.

At this point, the GeoRSS collaboration has completed work on two primary encodings that are called GeoRSS Geography Markup Language (GML) and GeoRSS Simple. GeoRSS GML is a formal Open Geospatial Consortium (OGC) GML Application Profile, and supports a greater range of features than GeoRSS Simple, notably coordinate reference systems other than WGS84 latitude/longitude. There is also a W3C GeoRSS serialization, which is older and partly deprecated but still the most widely used.

GeoRSS can be used to extend both RSS 1.0 and 2.0, as well as Atom, the IETF's latest standard for feeds.

Examples
Here's a GeoRSS Simple example using Atom. Here is a schema fragment for a GeoRSS GML encoding for RSS 2.0 Here is example of W3C geo GeoRSS

Examples of GeoRSS Implementations
Example feeds
 * Earthpublisher, Press Releases around the world (W3C GeoRSS)
 * GeoNetwork opensource: Simple and GML -feeds.
 * USGS Real-time, worldwide earthquake list for the past 7 days (W3C GeoRSS)

Usage and implementation
 * Google Maps: Google Maps API blog posting on Google support for the Simple, GML, and W3C Geo encodings of GeoRSS
 * Yahoo Maps, a reference on using GeoRSS in the Yahoo Maps Web Services.
 * Virtual Earth: Microsoft Virtual Earth support for GeoRSS geo, simple, and GML.
 * GeoPress WordPress and MovableType plugins for adding GeoRSS to your blog.
 * GeoRSS Module Drupal module for adding GeoRSS to your Drupal website.
 * Mapufacture GeoRSS Feed Aggregator.

Open source projects
 * OpenLayers Demo using the OpenLayers GeoRSS parser. GeoRSS geo and simple are supported.
 * Worldkit Both GeoRSS Simple and GeoRSS GML are supported.
 * GeoServer
 * The OGR Library provides support for read and write access to GeoRSS data.

Products
 * Cadcorp GeoRSS built into Cadcorp SIS.
 * CubeWerx WFS The new release of the CubeWerx OGC Web Feature Service product supports GeoRSS GML.
 * Ionic/Leica Geosystems The use of GeoRSS in Ionic redSpider products
 * Bay of Islands Contains GeoRSS information about local accommodation

Fun Sites Based on GeoRSS
 * Twitter Updates from World
 * Flickr Updates from World