Geotagging of pages is described at various sites (Geotagging, geo-tag.de, geotags.com, geourl.org). In essence there are two ways (both of which are supported by this plugin) to geotag a page, one using a microformat, the other using meta tags in the page header.
For a blog post on this please see: http://www.geodienstencentrum.nl/blog/webmapping/dokuwiki/2014-07-16/dokuwikispatial_geotag.html
The pages below show some examples of the geotag plugin.
There are various plugins for the most common browsers that will interact with geotagged pages, also seachengines will pick up the geo-information making the page locatable on a map.
Geotagged pages can be validated using the online validator at: http://www.geo-tag.de/validator/en.php
Useful generators are available at: http://www.geo-tag.de/generator/en.html and http://mygeoposition.com/