Semantic store and entity hub

Question

I am working on a content platform that should provide semantic features such as querying with SPARQL and providing rdf documents for the contained content.

• I would be very thankful for some clarification on the following questions:

• Did I get that right, that an entity hub can connect several semantic stores to a single point of access? And if not, what is the difference between a semantic store and an entity hub?

• What frameworks would you use to store content documents as well as their semantic annotation?

It is important for the solution to be able to later on retrieve the document (html page / docs such as pdf, doc,...) and their annotated version.

Thanks in advance,

Chris

Answer 1

The only Entityhub term that I know is belong to Apache Stanbol project. And here is a paragraph from the original documentation explaining what Entityhub does:

The Entityhub provides two main services. The Entityhub provides the connection to external linked open data sites as well as using indexes of them locally. Its services allow to manage a network of sites to consume entity information and to manage entities locally.

Entityhub documentation:
http://incubator.apache.org/stanbol/docs/trunk/entityhub.html

Enhancer component of Apache Stanbol provides extracting external entities related with the submitted content using the linked open data sites managed by Entityhub. These enhancements of contents are formed as RDF data. Then, it is also possible to store those content items in Apache Stanbol and run SPARQL queries on top of RDF enhancements. Contenthub component of Apache Stanbol also provides faceted search functionality over the submitted content items.

Documentation of Apache Stanbol:
http://incubator.apache.org/stanbol/docs/trunk/

Access to running demos:
http://dev.iks-project.eu/

You can also ask your further questions to stanbol-dev AT incubator.apache.org.

Answer 2

Alternative suggestion...

Drupal 7 has in-built RDFa support for annotation and is more of a general purpose CMS than Semantic MediaWiki

In more detail...

I'm not really sure what you mean by entity hub, where are you getting that definition from or what do you mean by it?

Yes one can easily write a system that connects to multiple semantic stores, given the context of your question I assume you are referring to RDF Triple Stores?

Any decent CMS should be assigning documents some form of unique/persistent ID to documents so even if the system you go with does not support semantic annotation natively you could build your own extension for this. The extension would simply store annotations against the documents ID in whatever storage layer you chose (I'd assume a Triple Store would be appropriate) and then you can build appropriate query and presentation layers for querying and viewing this data as required.