Most multimedia documents available today are agnostic to data semantics. Moreover, their specification language offers little to ease authoring of meaningful content. In this paper, we present the main entities of a new version (3.1) of the Nested Context Model (NCM), which concentrate efforts at integrating support for enriched concept description to the model. These extensions enable the specification of relationships between concept descriptions and multimedia content in the hypermedia way, composing what we call hyperknowledge in this paper. NCM previous version (3.0) is a hypermedia conceptual model. NCL (Nested Context Language), which is part of international standards and ITU recommendations, was engineered according to NCM 3.0 definitions. The extensions discussed in this paper contribute not only for advances in the NCL, but mainly as a conceptual model for hyperknowledge document engineering.