[NLP2RDF] Guidelines for RESTful NIF-based services

Tue Sep 23 13:04:58 CEST 2014

Hi,

I will jump in here ;)

It makes no sense to restrict NIF to REST, primarily because WebSockets are
IMHO so important for implementing practical linguistic web services. The
problem with REST is that it doesn't really support cometting
<https://en.wikipedia.org/wiki/Comet_(programming)>, and as such it can be
difficult to effectively keep a large pipeline going without having to make
a new connection for each dataset or having to handle with lag in the
production of data items.

As for JSON-LD, I do love the Raptor library but I call bullshit on this
quote... the Python guys can do it under 1000 LOC
<https://github.com/RDFLib/rdflib-jsonld/tree/master/rdflib_jsonld>...
Actually JSON-LD is super easy to implement for web services if you
restrict the services to handling only a single context URI. Then the
JSON-LD can be handled like normal JSON, hence no need for special RDF
parsers.

Regards,
John

On Tue, Sep 23, 2014 at 12:52 PM, Sebastian Hellmann <
hellmann at informatik.uni-leipzig.de> wrote:

>  Also, I still haven't found the time to check in detail whether it makes
> sense to restrict all NIF services to REST. In principle yes, but as
> written above, this needs some thought and I need to read about REST once
> more.
>
> JSON-LD will also come soon, but some RDF parsers don't read it, because
> it is too complicated to parse:
> http://librdf.org/raptor/
>
> all the best,
> Sebastian
>
>  JSON Serializers
>
> Two serializers for to write triples encoded in JSON:
>
>    1. json: in a resource-centric abbreviated form like Turtle or
>    RDF/XML-Abbreviated as defined by: RDF 1.1 JSON Alternate
>    Serialization (RDF/JSON)
>    <http://www.w3.org/TR/2013/NOTE-rdf-json-20131107/>, W3C Working Group
>    Note, 07 November 2013
>    2. json-triples: a triple-centric format based on the SPARQL results
>    in JSON format.
>
> JSON-LD is not supported - too complex to implement.
>
>
>
>
> On 23.09.2014 12:47, Sebastian Hellmann wrote:
>
> Hi Philipp,
> sorry, I should have taken a look earlier. I about to go on holiday in two
> days and as you might know the pre-holiday time is quite work intensive...
>
> Yes, the guidelines look very good. I am happy that you could extract this
> from documentation.
>
> Ciro deployed stanford and opennlp the other day and gets things runnging
> again:
>
> http://demo.nlp2rdf.org:9999/stanfordcorenlpn?f=text&i=This+is+a+test.&t=direct
>
> There are some minor changes, which need to be discussed.
>
> for begin and endIndex:
> Serializer should use xsd:int , Parser must accept xsd:int, xsd:long and
> xsd:nonNegativeInteger and no datatype
> Note: xsd:int (32-bit signed int) is optimized by most databases and
> therefore provides benefits for SPARQL out of the box.
> xsd:nonNegativeInteger is the correct datatype allowing the right-open
> interval of [0,inf) but I am not sure, if this datatype is implemented.
>
>
> for anchorOf and isString:
> Serializer must use xsd:string
> -> this is to avoid people adding nametags, which can be ambiguous.
>
> Other than that very good.
> There is a second way to chain parsers via:
> curl http://service1 -d t="url"   --dataurlencode
> "http://demo.nlp2rdf.org:9999/stanfordcorenlpn?f=text&i=This+is+a+test.&t=direct"
> <http://demo.nlp2rdf.org:9999/stanfordcorenlpn?f=text&i=This+is+a+test.&t=direct>
>
> All the best,
> Sebastian
>
> On 23.09.2014 09:16, Philipp Cimiano wrote:
>
> Dear all,
>
>   I was wondering why I have received no feedback other than from Mariano
> Rico on the document I sent two weeks ago. My goal is to finalize the
> guidelines for the LIDER project this week, so I would appreciate any
> feedback. Confirming that the way we have implemented the NIF-based
> services is fine would also be an important type of feedback ;-)
>
> I attach the document again for ease of reference.
>
> Any feedback is welcome, thanks a lot!
>
> Philipp.
>
> Am 09.09.14 16:27, schrieb Philipp Cimiano:
>
> Dear all,
>
>  I just joined the list. In the context of the European LIDER project, I
> am trying to put together some guidelines on how to implement NIF-based
> Restful NLP services.
>
> Our student Benjamin Siemoneit (CC) has put together a document describing
> how he has set up two services, wrapping the Stanford POS tagger and the
> Stanford parser.
>
> The document is attached. I would be very happy to get some feedback on
> the document, i.e. on
>
> 1) Parameters of services
> 2) use of NIF vocabulary
> 3) chaining of services via curl
>
> Enjoy the document ;-)
>
> Philipp.
>
>
>
>
> _______________________________________________
> NLP2RDF mailing listNLP2RDF at lists.informatik.uni-leipzig.dehttp://lists.informatik.uni-leipzig.de/mailman/listinfo/nlp2rdf
>
>
>
> --
> Sebastian Hellmann
> AKSW/NLP2RDF research group
> Insitute for Applied Informatics (InfAI) and DBpedia Association
> Events:
> * *Sept. 1-5, 2014* Conference Week in Leipzig, including
> ** *Sept 2nd*, MLODE 2014 <http://mlode2014.nlp2rdf.org/>
> ** *Sept 3rd*, 2nd DBpedia Community Meeting
> <http://wiki.dbpedia.org/meetings/Leipzig2014>
> ** *Sept 4th-5th*, SEMANTiCS (formerly i-SEMANTICS) <http://semantics.cc/>
> Venha para a Alemanha como PhD: http://bis.informatik.uni-leipzig.de/csf
> Projects: http://dbpedia.org, http://nlp2rdf.org,
> http://linguistics.okfn.org, https://www.w3.org/community/ld4lt
> <http://www.w3.org/community/ld4lt>
> Homepage: http://aksw.org/SebastianHellmann
> Research Group: http://aksw.org
> Thesis:
> http://tinyurl.com/sh-thesis-summary
> http://tinyurl.com/sh-thesis
>
>
> _______________________________________________
> NLP2RDF mailing listNLP2RDF at lists.informatik.uni-leipzig.dehttp://lists.informatik.uni-leipzig.de/mailman/listinfo/nlp2rdf
>
>
>
> --
> Sebastian Hellmann
> AKSW/NLP2RDF research group
> Insitute for Applied Informatics (InfAI) and DBpedia Association
> Events:
> * *Sept. 1-5, 2014* Conference Week in Leipzig, including
> ** *Sept 2nd*, MLODE 2014 <http://mlode2014.nlp2rdf.org/>
> ** *Sept 3rd*, 2nd DBpedia Community Meeting
> <http://wiki.dbpedia.org/meetings/Leipzig2014>
> ** *Sept 4th-5th*, SEMANTiCS (formerly i-SEMANTICS) <http://semantics.cc/>
> Venha para a Alemanha como PhD: http://bis.informatik.uni-leipzig.de/csf
> Projects: http://dbpedia.org, http://nlp2rdf.org,
> http://linguistics.okfn.org, https://www.w3.org/community/ld4lt
> <http://www.w3.org/community/ld4lt>
> Homepage: http://aksw.org/SebastianHellmann
> Research Group: http://aksw.org
> Thesis:
> http://tinyurl.com/sh-thesis-summary
> http://tinyurl.com/sh-thesis
>
> _______________________________________________
> NLP2RDF mailing list
> NLP2RDF at lists.informatik.uni-leipzig.de
> http://lists.informatik.uni-leipzig.de/mailman/listinfo/nlp2rdf
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.informatik.uni-leipzig.de/pipermail/nlp2rdf/attachments/20140923/ce3695e4/attachment.html>