TagSpace
From TagCommons
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The TagSpace for a Tagging is like a namespace -- a context in which to interpret the TagLabel. It is a necessary distinction to capture when aggregating tag data. For example, Technorati serves up tag data from many different blogs, and the tag assertions from multiple sources can point to a TagSpace other than themselves to qualify the context of the TagLabel. For instance, a blogger from domain blogger.com can tag an item with the TagLabel "squaredcircle", and the hypertext under the tag link could point to the Flickr tag "squaredcircle". The meaning of this would be "I tag this item with Flickr's notion of squaredcircle". In this case, the TagSpace would be some identification for Flickr's tags, such as http://www.flickr.com/photos/tags/.
An additional value of identifying a TagSpace independent of TagSource is to allow for an ecosystem of naming services (perhaps based on well-designed vocabularies) as well as large social web sites whose folksonomies reflect the nature and history of their communities.
At the level of conceptualization, any universally identifiable thing could be a TagSpace. At the level of ontology, there may be specific constraints on the identity (such as it must be a URL domain or URN namespace). At the level of data formats, there may be additional constraints such as the Rel-Tag Microformat requirement that the last string component in the URL path under a Tagging be the same as the TagLabel.
