The GeoRSS module for Drupal allows for geodata in GeoRSS format to be extracted from nodes in incoming aggregator2 feeds and also adds the correct tags to outgoing RSS feeds from Drupal sites.
ogc
Drupal WFS Server module
The WFS Server module for Drupal will allow geographic information systems (GIS) to query Drupal sites about geodata they are storing and then communicate it back using the Open Geospatial Consortium standard for Web Feature Services.