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Date: Sun, 1 Feb 2015 12:26:50 +0100
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Subject: Re: a question on CSV to RDF conversion
From: Cevahir Demirkiran <cev.demirkiran@gmail.com>
To: Lewis John Mcgibbney <lewis.mcgibbney@gmail.com>
Cc: "dev@any23.apache.org" <dev@any23.apache.org>
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Hi Lewis;

Thanks a lot for your answer.


> >1. What is an ExtractionContext? Do I define it above correctly?
>

No, you've passed in a String which relates to absolutely nothing. You
would need to actually name an extractor. You can check out the Javadocs
for concrete specification
http://any23.apache.org/apidocs/index.html?org/apache/any23/extractor/ExtractionContext.html

I am going to try HTTPDocumentSource for sure.

This is what I would like to ask exactly.
In fact I have already checked the API doc for ExtractionContext, we have
*ExtractionContext
<https://any23.apache.org/apidocs/org/apache/any23/extractor/ExtractionContext.html#ExtractionContext(java.lang.String,
org.openrdf.model.URI)>*(String
<http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true>
extractorName,
org.openrdf.model.URI documentURI)

Now what is String extractorName? Here I passed the name of my extractor
variable which is wrong. What do you mean by naming an extractor? What
should I pass there?

As of URI, I guess it is the URI of the document which I need to convert I
guess, which may be something like
file://....

Or is it the target document URI?

2015-01-31 21:28 GMT+01:00 Lewis John Mcgibbney <lewis.mcgibbney@gmail.com>:

> Hi Cevahir,
>
> Low hanging fruit here is to run this through our online service.
>
> http://any23-vm.apache.org
>
> If you are getting some triples back then you are good. Then you need to
> ensure that you can reproduce using some code.
>
>
>
>> >Upon running the above code using the sample input provided in the link:
>> >http://any23.apache.org/dev-csv-extractor.html
>> >
>> >
>> >I get no output, I mean the outputfile sample.rdf is empty.
>> >I checked whether there are any issues however I couldn't see anything.
>>
>
> Did you debug this? I mean this could potentially be the fact that your
> path if incorrect. Did you check you are actually reading data from a CSV
> file?
>
>
>> >
>> >
>> >I would be extremely thankful in case you could inform me: I have been
>> >searching the web for some info, however all I can get is the javadoc,
>> >finally I decided to send an email:
>>
>
> Thank you for coming to the list. CSV extraction has been pretty stable an
> untouched for a while now. We are very keen to ensure that the code is
> capable of CSV --> RDF conversions.
>
> In all honestu I would advise you to NOT use the CSV extractor explicitly.
> Why don;t you try using the code we provide here
> http://any23.apache.org/dev-data-extraction.html
> The HTTPDocumentSource can be switched for a DocumentSouce and you can
> read your data that way. It also means your code is more flexible and will
> save you time in the future when you need to extract from XHTML for example.
>
>
>> >
>> >
>> >1. What is an ExtractionContext? Do I define it above correctly?
>>
>
> No, you've passed in a String which relates to absolutely nothing. You
> would need to actually name an extractor. You can check out the Javadocs
> for concrete specification
>
> http://any23.apache.org/apidocs/index.html?org/apache/any23/extractor/ExtractionContext.html
>
>
>> >2. Where is the error?
>>
>
> I don't think there is an error. I think that nothing is happening. Your
> code is not doing anything. If you follow the above then it will do
> something for you i promise.
>
>
>> >3. I would actually like to convert entities for example such as :
>> >
>> >
>> >first name, last name, age, address, ...
>> >Davide; Palmisano; 30; ..
>
>
>
> Piece of cake
>
>> >
>> >
>> >How am I going to introduce schema.org <http://schema.org> vocabulary
>> >into conversion configuration? What are the relevant APIs?
>>
>
> You don;t need to. We've already implemented this for you.
>
>
>> >
>> >
>> >Is it the URI I put inside the extractionContext? (or this URI is for
>> >introducing the
>> >schema.org <http://schema.org> - so context comes from there )
>>
>
> No this is your target URI from which you wish to build a triples
> manifestation. You do not need to care about the individual nature of the
> vocabularies you wish to recognize within source data. Any23 will do this
> for you.
>
>
>> >Thank you for your time and your valuable help.
>> >Once the issue is going to be resolved, I also hope to post it in the
>> >internet so that more people can get help concerning this.
>> >
>
>
> Well it is on the internet now. I hope that you are able to use Any23 for
> your task.
> Please post to this list if you have further difficulties and we can help
> you.
> Lewis
>
>

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