Dynamically define new classes of annotation

[Alain Désilets]

I have a webapp that needs to support the creation of brand new Entity types and to have those new types be active without needing to restart the webapp.

I understand that I can define the new entities in a typesystem.xml file, but is there a streamlined way to:

- generate the annotation .class files from this typesystem.xml file
- load those classes dynamically in the currently running webapp?

Thx.

[Richard Eckart de Castilho]

Hi,

There is no need to generate class files from the typesystem.xml. It is not even necessary to have a typesystem.xml file at all since you can set up a type definition purely programmatically.

In the WebAnno/INCEpTION annotation editors, we do this:

1) use uimaFIT to scan for type system files in the classpath (org.apache.uima.fit.factory.TypeSystemDescriptionFactory.createTypeSystemDescription())
2) programmatically generate type definitions for any of the custom types that the users have created as part of their annotation projects
3) merge the two (org.apache.uima.util.CasCreationUtils.mergeTypeSystems(Collection<? extends TypeSystemDescription>))
4) create a CAS object from the merged type systems (org.apache.uima.util.CasCreationUtils.createCas(TypeSystemDescription, TypePriorities, FsIndexDescription[]))
5) use the CAS API (not the JCas API) to store/access annotations in the CAS - the CAS API does not rely on pre-generated classes (contrary to the JCas API)

Cheers,

-- Richard

[Alain Désilets]

As usual, thanks Richard.

Alain

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[Alain Désilets]

1) use uimaFIT to scan for type system files in the classpath (org.apache.uima.fit.factory.TypeSystemDescriptionFactory.createTypeSystemDescription())

 

2) programmatically generate type definitions for any of the custom types that the users have created as part of their annotation projects

In my particular case, I have a typesystem.xml  on disk, but it's not in the classpath. Is there a way I can read this file into the TypeSystemDescription created in step 1)? I have been snooping around the doc for DKpro and UIMA and I can't find such methods.

[Richard Eckart de Castilho]

On 11. Jun 2019, at 13:12, Alain Désilets <alainde...@gmail.com> wrote:
>
> In my particular case, I have a typesystem.xml on disk, but it's not in the classpath. Is there a way I can read this file into the TypeSystemDescription created in step 1)? I have been snooping around the doc for DKpro and UIMA and I can't find such methods.

https://uima.apache.org/d/uimafit-current/api/org/apache/uima/fit/factory/TypeSystemDescriptionFactory.html#createTypeSystemDescriptionFromPath-java.lang.String...-

Cheers,

-- Richard