Improve Fetching of Entity Information during the enhancement process
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Key: STANBOL-336
URL: https://issues.apache.org/jira/browse/STANBOL-336
Project: Stanbol
Issue Type: Improvement
Components: Enhancer
Reporter: Rupert Westenthaler
Short overview about the current Situation:
Previously the CachingDereferncingEngine was used do dereference information of
Entities referenced in enhancement results. This engine loaded Entity data
directly by using there IDs and stored the data in a Clerezza Graph. It was
introduced before the Entityhub was implemented and was never updated to use
the Entityhub.
STANBOL-333 removed the CachingDereferncingEngine and added support to
dereference Entities via the Entityhub directly to the
NamedEntityTaggingEngine.
However the removal of the CachingDereferncingEngine had the side effect that
currently no other engine supports this feature. Engines must now support the
fetching of entity data otherwise such data can no longer be provided.
In cases where multiple Engines support this features users would need to
change the configuration for several engines in order to probably
active/deactivate this feature. Activation/Deactivation for single requests
would not be possible.
The proposal how to deal with fetching of entity information in future:
* Move the configuration for the default value to enable/disable dereferencing
of Entity information to a central component (probably as a property of the
EnhancerWebFragment)
* Add a possibility that allows users to override the default value for
specific requests. This could use an additional parameter or also a HTTP header.
* Store the entity-dereference-state within the metadata of the Content-Item.
* If the entity-dereference-state is set to true EnhancementEngines MAY add
entity information to the enhancement graph. This is especially useful if an
engine does already fetch the required entity information during the
enhancement process.
* To allow users to also fetch entity information that are not added during the
enhancement process we might want to reintroduce a DereferenceingEngine that
can dereference missing Entities. This engine MUST BE able to use the Entityhub
with the option to also dereference Entities via there URI if they are not
available via the Entityhub.
WDYT
Rupert
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