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Re: RDF and Semantic (X)HTML

From: Sigfrid Lundberg, Lub NetLab <siglun@gungner.lub.lu.se>
Date: Tue, 24 Oct 2000 14:08:26 +0200 (MET DST)
To: "Sean B. Palmer" <sean@mysterylights.com>
cc: www-rdf-interest@w3.org
Message-ID: <Pine.LNX.3.96.1001024135406.2041H-100000@gungner>
On Tue, 24 Oct 2000, Sean B. Palmer wrote:

> Hi Sigfrid,
> 
> > First, metadata _is_ data_.
> 
> And hence the phrase: data describing data. But then, do we need further
> data to describe that, and so on: data describing data describing data
> describing data describing data...

No, we only need data and metadata.

 
> > For an object Dan's list of publications in
> > RDF, it is more a description of Dan and his professional life than a
> > description of his home page.
> 
> That stuff is interesting, but I'm referring to the profile of the W3C front
> page (www.w3.org), and automatic (XSLT, I think) generations thereof.
> 
> > The term "metadata" has become broader than
> > it used to be. Dan's interesting example is automatic transformation of
> > sementics already present in his pages, not automatic generation of data.
> > There is a fundamental distinction between the two.
> 
> Hmmmm.....could you explain what you mean by that? Semantic data is still
> data.
>
> > Automatic or manual generation of the of data/metadata, and the costs and
> > benefits of the two is beyond the scope of RDF as well as of DC. The
> > former is about methods for defining semantics of and encoding (meta)data,
> > and the latter is a particular set of semantics.
> 
> Well, most people use XSLT for transformations: but I was wondering how it
> can hold up to that type of generation (XHTML to RDF). Using standard XSLT
> sheets you could automatically generate a site profile on the fly(?)

Given that the markup is semantic to begin with. Then you can obviously do
that on the fly. The task is to do that markup
 
> > The automatic generation of a summary of a text is computer linguistics,
> > so is to extract and normalize keywords (using stemming and the like)  and
> > to find the category of a text is automatic classification [1,2]. Neither
> > RDF, nor DC, will help you with this.
> 
> Yes, I realise you cannot automatically generate a summary of text. That is
> down to the author. But you can classify the structure of a page, and
> generically determine what its purpose is.

Actually you can do quite a lot automatically. See for instance

http://www.cs.columbia.edu/~hjing/summarization.html


Sigfrid
Received on Tuesday, 24 October 2000 08:06:02 GMT

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