Description

Templator is a module for dependency-driven SPARQL template generation from natural language.

Templator takes in a question and generates pseudo-queries as well as a list of strings (so-called slots) for which data from the knowledge base is needed.

Approach

First, the question is linguistically analysed, annotating it with part-of-speech tags, dependency relations, and semantic role labels. Second, the resulting parse tree is transformed into a template, covering one possibility of the how natural language expressions correspond to constructs in the target SPARQL query. This is the template that is most faithful to the linguistic structure of the question.

In order to also account for structural differences between the question and the target query, the template is modified by a sequence of steps that collapse or expand triples, yielding additional templates.

The scoring of the templates follows a simple heuristics computing the number of nodes in the query body that are neither projection variables nor slots. In addition, each rewriting operation reduces the score by a predetermined factor.

Function

Scope and limit

Issues and discusion

Source code

Contacts