Graphicator

Graphicator is the first module of the LODQA system.

It produces a graph representation of a given NL query as illustrated below:

As the first module which handles the NL query, it is responsible for parsing the NL query, and producing a structured graph representation of the query, which we call a pseudo graph pattern (PGP). A PGP contains nodes and relations. Typically, the nodes correspond to the basic noun phrases (BNPs) in the NL query, and the relations to the dependency paths between the BNPs as expressed in the NL query. Additionally, a PGP specifies which node is the focus of the query, i.e. what the user wants to get as the answer of the query, e.g., “genes” in the above example query.

A PGP is a graph pattern as we want to search a target RDF graph for sub-graphs which correspond to the PGP. However, we call it a “pseudo” graph pattern, since it is not yet grounded at the target dataset.