| Basically that means that the namespace does not only rely on RDF validation and that xml files with a reference to the XSD can programmatically detect flaws in formatting. This could be extremely useful when communicating a lot of data (in for example OAI-PMH) with ccREL attached to it. I can think of an example where archives who own the rights of their works want to use xml to communicate their metadata.
An XSD could state that you can use 0..n jurisdictions for license description, the date of deprecatedOn needs to be in a specific format, legalcode needs be a valid URI, etc.
An XSD would both be to describe a simple reference to license documents as well as license definitions.
I believe I can find the time to work on a draft version of this file in the next weeks/months if this is useful to develop.
Best,
On Jul 2, 2010, at 24:11 , Nathan Yergler wrote: We publish an RDF schema ( http://creativecommons.org/schema.rdf) which could be used to determine validity of CC REL properties/assertions (ie, are they valid terms), but have not published an XSD to date. This is due to the fact that we're primarily knowledgeable about RDF, and a lack of demand. Can you elaborate on what sort of CC REL data you want to validate? License assertions about a work? License definitions? If we can construct an XSD that meets your needs and accurately models CC REL, I'd be happy to publish it on creativecommons.org and link to it from our namespace ( http://creativecommons.org/ns). I can see how having this would be very interesting for OAI-PMH and other applications. Is this something we could collaborate on developing? Regards, Nathan On Wed, Jun 30, 2010 at 7:37 AM, Maarten Zeinstra < mz AT kl.nl> wrote: Thanks I will use it like this for the moment,
Would it be a good idea to look into an xsd for ccREL?
There is already a good human readable guideline, but as far as I can find
no automated way of checking the validity of data structured in ccREL.
Looking deeper into OAI-PMH I see that they have some structures available
to put rights informationan, although this refers to the metadata itself not
the object is describes.
Adoption of ccREL in a future version of OAI-PMH could benefit the use of
ccREL greatly as well as giving archives a way to more accurately describes
the rights status of the works they put out there.
Cheers,
Maarten Zeinstra
Kennisland | Knowledgeland
T: +31.20.575.6720 | E: mz AT kl.nl
www.kennisland.nl | www.knowledgeland.org
On Jun 30, 2010, at 24:14 , Nathan Yergler wrote:
That makes sense to me, Maarten.
NRY
On Tue, Jun 29, 2010 at 4:58 AM, Maarten Zeinstra <mz AT kl.nl> wrote:
Hi Nathan,
I used this as my starting point:
http://www.openarchives.org/OAI/2.0/rdf.xsd
which is the structure to include rdf in the OAI protocol
I derived from that that construct needs to have the following form:
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xsi:schemaLocation="http://www.w3.org/1999/02/22-rdf-syntax-ns#
http://www.openarchives.org/OAI/2.0/rdf.xsd">
</rdf:RDF:>
Then I probably made a mistake by replacing
http://www.openarchives.org/OAI/2.0/rdf.xsd
with
http://creativecommons.org/ns#
instead of replacing the first
http://www.w3.org/1999/02/22-rdf-syntax-ns#
I am equally not sure about the schemalocation.
Probably the right way to use ccREL here is:
<rdf:RDF
xmlns:cc="http://creativecommons.org/ns#"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xsi:schemaLocation="http://www.w3.org/1999/02/22-rdf-syntax-ns#
http://www.openarchives.org/OAI/2.0/rdf.xsd">
</rdf:RDF:>
Would you agree?
Maarten Zeinstra
Kennisland | Knowledgeland
T: +31.20.575.6720 | E: mz AT kl.nl
www.kennisland.nl | www.knowledgeland.org
On Jun 28, 2010, at 19:19 , Nathan Yergler wrote:
Hi Maarten,
We do not currently have an XSD for the CC namespace, so assuming you
can include RDF directly, that seems like the easiest way to get
started. Note that I'm not an expert on OAI-PMH, so I'm not certain
that's possible.
That said, the example you gave seems a little strange to me. In the
rdf:RDF element, you declare the rdf as
"http://www.w3.org/1999/02/22-rdf-syntax-ns#". Under normal RDF/XML
rules (assuming those apply here) "rdf:attributionName" would be
interpreted as http://www.w3.org/1999/02/22-rdf-syntax-ns#attributionName.
I don't think that's what you're going for. I'd expect to see
something like:
<rdf:RDF
xmlns:rdf=”http://www.w3.org/1999/02/22-rdf-syntax-ns#”
xmlns:cc="http://creativecommons.org/ns#">
and then "cc:attributionName", "cc:attributionUrl", etc. I'm also not
clear what the point of xsi:schemaLocation is on rdf:RDF.
Apologies if my comments reveal some deep-seated misunderstanding of
OAI-PMH. It'd be great to have a functional example of CC REL in
OAI-PMH, so I'd love to work through the issues and get this
documented.
Regards,
Nathan
On Mon, Jun 28, 2010 at 7:35 AM, Maarten Zeinstra <mz AT kl.nl> wrote:
Hello list,
I'm trying to make an implementation of ccREL for OAI-PMH to communicate
specific ccREL information. I could not find examples or explanations how
this could be added so I thought I post it on the list.
I've used the standard RDF implementation to bypass the need to have an xsd,
which as far as I know there is none of ccREL is there?
That would result to a record that would like this? Wouldn't it?
<record>
<header>
<identifier>...</identifier>
<datestamp>1962-05-04T00:00:00Z</datestamp>
</header>
<metadata>
<oai_dc:dc xsi:schemaLocation="
http://www.openarchives.org/OAI/2.0/oai_dc/
http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
....
</oai_dc:dc>
<rdf:RDF
xmlns:rdf=”http://www.w3.org/1999/02/22-rdf-syntax-ns#”
xsi:schemaLocation=
”http://www.w3.org/1999/02/22-rdf-syntax-ns#
http://creativecommons.org/ns#”>
<RDF:attributionName>
[maker]
</RDF:attributionName>
<RDF:attributionURL>
[locatie op openbeelden.nl]
</RDF:attributionURL>
<RDF:license>
[licentie url]
</RDF:license>
</rdf:RDF>
</metadata>
</record>
Best,
Maarten Zeinstra
Kennisland | Knowledgeland
T: +31.20.575.6720 | E: mz AT kl.nl
www.kennisland.nl | www.knowledgeland.org
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