Applied Semantic Web Technologies

362  ◾  Jon Atle Gulla et al.

13.5.4 Syntactic Query Reformulation

With syntactic query reformulation, we map a syntactic query onto semantic con-

cepts, interpret the query semantically, and map the result back to a syntactic query

of weighted terms (Solskinnsbakk and Gulla, 2008). Unlike semantic query refor-

mulation, this approach uses a standard inverted index based on term–document

matrices and requires that ontologies be trained on a representative set of docu-

ments in the document collection. For every concept in the ontology, we allocate

a set of relevant documents from this set and generate a concept signature for con-

cept i, C

i

= (