We are happy the TagCommons added the link of SCOT project in the web site. The TagCommons has the goal as following.

The goal of this effort is to specify an agreement that specifies a common semantics and possible means for sharing or computing over tag data from heterogeneous, independently developed sources. This is a technology stack of a conceptualization, ontologies that formally specify it, and bridges to symbol-level formats and APIs.

The SCOT project has almost same goal. We try to provide the framework for sharing and reusing social tagging data and to provide the APIs. We will find out how to interlink different tag ontologies.