Odinson queries

Odinson supports two main types of query patterns, basic queries and event queries. Each type of query can hop between surface representations and graph traversals (e.g., syntactic dependencies) using a combination of token constraints and graph traversals.

A basic query minimally contains a token pattern (one or more token constraints), but optionally can also include graph traversals and additional token patterns. Example:

girl >nmod_from Ipanema

An event query requires a trigger, a token pattern that indicates a possible match, and can have arguments, i.e., patterns anchored on the trigger. A simple example of this would be having a certain verb as a trigger (e.g., "cause"), and looking for the subject and object of the verb to serve as the agent and the theme of the event.

In addition to the two types of queries above, aimed at matching patterns within the body of a document, Odinson supports parent queries, which filter the document collection based on information in the document metadata before an odinson query executes. Parent queries use Lucene query syntax.