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ZNG  September 2001

ZNG September 2001

Subject:

Re: ZNG, RDF Syntax and RDF Schema

From:

Poul Henrik Jørgensen <[log in to unmask]>

Reply-To:

Z39.50 Next-Generation Initiative

Date:

Wed, 26 Sep 2001 16:29:46 +0200

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (85 lines)

Hi Matthew.

You questions below induced me to think the matter through once more.
Below is an attempt to illustrate my proposal with examples.
Your comments are very welcome - and useful.

1. Metadata Vocabulary
======================
Assume, that farmer Joe has declared the following vocabulary (Namespace) -
by means of RDF Schema or otherwise:

Object Class: CID=Fruit. Superclass=Entity
Object Class: CID=Apple. Superclass=Fruit
Object Class: CID=Pear, Superclass=Fruit

Property: PID=Taste. Domain=Fruit. Range=("Sour", "Sweet")
Property: PID=Colour. Domain=Fruit. Range=("Red", "Green")

2. Metadata Instance
====================
Being a forward-looking businessman, the Joe has established a ZNG Server
with information about his products.
In reply to a query about his products, he informs that apples are Red and
Sweet, while Pears are Green and Sour.
Joe has not bothered to declare a special format for his information. So he
just defaults to the RDF Serialization Syntax:

<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xmlns:gs="http://FarmerJoe/Meta/GreenStuff/">
        <rdf:Description rdf:about="http://FarmerJoe/Products/Apple/">
                <gs:Taste>Sweet</gs:Taste>
                <gs:Colour>Red</gs:Colour>
        </rdf:Description>
        <rdf:Description rdf:about="http://FarmerJoe/Products/Pear/">
                <gs:Taste>Sour</gs:Taste>
                <gs:Colour>Green</gs:Colour>
        </rdf:Description>
</rdf:RDF>

3. Something Else
=================
Do you think, that this would be practical, i.e. to just reference the RDF
Serialization Syntax and the Vocabulary Namespace?

- Or do you have a better solution to the problem of how to format metadata
without a predefined format?

Best regards,
Poul Henrik


-----Original Message-----
From: Matthew Dovey [mailto:[log in to unmask]]
Sent: 26. september 2001 13:08
To: [log in to unmask]
Subject: Re: ZNG, RDF Syntax and RDF Schema


Poul,

So by "default" format are you suggesting that

a) ZNG recommends that anyone with a vocabulary (such as Ray at present)
should use RDF to specify an XML instantiation of that vocabulary.
Providing that the structure of this XML instantiation can be given a
unique identifier (a URL), we can use this as the RecordSchema
designator in ZNG

or

b) the RecordSchema in the ZNG Request or Response could just reference
a vocabulary - in which case the XML instantiation is derived from the
vocabulary in RDF. This assumes that given a vocabulary it is possible
to derive a single or canonical RDF structure (i.e. how do we cope with
two servers having very different RDF expressions of the same
vocabulary?)

or

c) something else?

Matthew

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