SocialTags

SocialTags is a new feature of OpenCalais that attempts to emulate how a person would tag a specific piece of content. For example, if you submit a story about Barack Obama and a piece of legislation – at least one reasonable tag would be “U.S. legislation”. A story about the relative merits of BMWs, Ferraris and Porsches should probably be tagged “sports cars” and “luxury makes” as well as "auto racing" and "motorsport".

SocialTags isn’t true semantic extraction – but rather an attempt to provide common-sense tags for a piece of content as a whole that you can then use for organizing and navigating your content. In conjunction with Calais semantic extraction capabilities you have the best of both worlds: Semantic Tagging to extract predefined structured information and Social Tagging to provide your users with another way to use your content.

In order to enable SocialTags extraction, a new value, SocialTags, was added for the enableMetadataType input parameter in paramsXML. 

Format is:

<c:processingDirectives .... c:enableMetadataType="GenericRelations,SocialTags,..."   >

If SocialTags is enabled, the RDF document will also include the SocialTags version number.

A topic extracted by Categorization with a score higher than 0.6 will also be extracted as a SocialTag. If its score is higher than 0.8, its importance (as a SocialTag) will be set to 1. If the score is between 0.6 and 0.8 its importance is set to 2.