NdFluents: A Multi-dimensional Contexts Ontology
  Annotating semantic data with metadata is becoming more and more important to
provide information about the statements being asserted. While initial
solutions proposed a data model to represent a specific dimension of
meta-information (such as time or provenance), the need for a general
annotation framework which allows representing different context dimensions is
needed. In this paper, we extend the 4dFluents ontology by Welty and Fikes---on
associating temporal validity to statements---to any dimension of context, and
discuss possible issues that multidimensional context representations have to
face and how we address them.
