KnowID: An Architecture for Efficient Knowledge-Driven Information and Data Access

Table 1 is a summary of the distinguishing features of varying computational cost. Figure 1 is a high-level overview of the four approaches, where Lx means (declarative) representation language and Qx the query language.

K is shorthand for the information and knowledge-level content and D is shorthand for instance-level content, irrespective of the formalism and technology used. Figure 2 shows two graphical renderings of a sample ARM schema, resembling a relational model graphical notation (left; source: based on a section of the diagram in ref. [10]) and in ontology-like notation similar to the ARM notation in ref.[25].