Statistical Web Service Parameters

Table of Contents Web Service Parameters Filters Coreference resolution (CoreferenceResolution) Confidence (ConfidenceFilter) Support (SupportFilter) Types (TypeFilter) Sparql (SparqlFilter) Spotter

Web Service Parameters

All parameters accepted by DBpedia Spotlight are describing in the WADL (Web Application Description Language) file.

Following there are a description of each parameter used by the web service. Many of them are used in the filter and are described in that section.

text or url (Required): text or url to be annotated.

Filters

It is possible to remove unwanted annotations through the endpoints using filters parameters. These filters are available in /candidates and /annotate (applied after disambiguation step) endpoints.

Coreference resolution (CoreferenceResolution)

It is a heuristic that seeks coreference in all text and infer the surface form. When is true, no other filter will be applied.

Available in: /candidates, /annotate

Parameter name: coreferenceResolution

Parameter type: boolean

Default value: true

Confidence (ConfidenceFilter)

Selects all entities that have a percentageOfSecondRank greater than the square of value informed.

Available in: /candidates, /annotate

Parameter name: confidence

Parameter type: number(double)

Default value: 0.1

Support (SupportFilter)

Selects all entities that have a support greater than informed.

Available in: /candidates, /annotate

Parameter name: support

Parameter type: number(integer)

Default value: 10

Types (TypeFilter)

Combined with policy parameter, select all entities that have the same type - if policy is whitelist. Otherwise - if policy is blacklist - select all entities that have not the same type.

Usage:

types=DBpedia:PopulatedPlaces,DBpedia:Thing

Available in: /candidates, /annotate

Parameter name: types

Parameter type: string

Sparql (SparqlFilter)

Combined with policy parameter, select all entities that match with the query result - if policy is whitelist. Otherwise - if policy is blacklist - select all entities that no match with the query result.

Available in: /candidates, /annotate

Parameter name: sparql

Parameter type: string

Spotter

Spotters are algorithms that select all candidates for possible annotations. There are two kind of implementations. In the language-independent implementation, the candidates are generated by traversing a finite state automaton encoding all possible sequences of tokens that form known spot candidates.

In the language-dependent implementation, candidates are generated using three methods: 1. identifying all sequences of capitalized tokens, 2. identifying all noun phrases, prepositional phrases and multi word units, 3. identifying all named entities. Methods 2 and 3 are performed using Apache OpenNLP6 models for phrase chunking and Named Entity Recognition.

Available in: /candidates, /annotate, /spot

Parameter name: sparql

Parameter type: string

Default value: Default

Possible values:SpotXmlParser

You can change the strategy using for spotting by changing the value of the &spotter= parameter passed to our web service. Supported spotters:

• SpotXmlParser, assumes that another tool has performed spotting and encoded the spots as SpotXml.

See: org.dbpedia.spotlight.model.SpotterConfiguration.SpotterPolicy