[oslc-core] Need for an XML literal value type

[Arthur Ryman]

Ian,

The following is the way to include the XML:

<dc:title rdf:parseType="Literal"><b>This is a title</b></dc:title>

When you want to check RDF/XML syntax, try the W3C RDF Validation Service. 
[1]

Here's a complete valid RDF/XML document that contains literal XML:

<?xml version="1.0"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns:dc="http://purl.org/dc/elements/1.1/">
  <rdf:Description rdf:about="http://www.w3.org/">
    <dc:title rdf:parseType="Literal"><b>This is a title</b></dc:title>
  </rdf:Description>
</rdf:RDF>
 
[1] http://www.w3.org/RDF/Validator/

Regards, 
___________________________________________________________________________ 

Arthur Ryman, PhD, DE


Chief Architect, Project and Portfolio Management

IBM Software, Rational

Markham, ON, Canada | Office: 905-413-3077, Cell: 416-939-5063
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From:
Ian Green1 <ian.green at uk.ibm.com>
To:
Dave <snoopdave at gmail.com>
Cc:
oslc-core at open-services.net
Date:
03/18/2010 01:08 PM
Subject:
Re: [oslc-core] Need for an XML literal value type
Sent by:
oslc-core-bounces at open-services.net



One glitch with this is that you cannot put xml, as a string, in an 
RDF/XML inner text.

that's what parseType="Literal" is for.

eg
        <dc:title><b>This is a title</b></dc:title>

is not valid in RDF/XML.

parseType literal yields a typed RDF literal of rdf:datatype 
rdf:XMLLiteral, in the RDF type model.  I suppose you can always escape 
xml into a string but this is mostly inconvenient and unnecessary.

i agree that these could be separate resources with the appropriate 
media-type, and in some cases this is preferred.  in the case of RM v1, we 

chose to have inlined data because it felt natural;  separate resources 
complicates the api for resource creation should mandatory xhtml values 
have to be created before the requirement referencing that value can be 
created. 

best wishes,
    -ian

ian.green at uk.ibm.com (Ian Green1/UK/IBM at IBMGB)
Chief Software Architect, Requirements Definition and Management
IBM Rational



From:
Dave <snoopdave at gmail.com>
To:
oslc-core at open-services.net
Date:
18/03/2010 13:24
Subject:
[oslc-core] Need for an XML literal value type
Sent by:
oslc-core-bounces at open-services.net



I'm still a little concerned about adding XML literal as a value type
and I'm trying to understand the pros and cons. The only justification
that we have so far for adding an XML literal value is for storing
XHTML data, which we need for rich text, but we can easily store XHTML
data as a string.

What specifically do we gain by putting XHTML content in-line in our
RDF/XML and Atom XML representations?

And conversely, what do we lose by not doing so?

Also, does putting XHTML content in-line in RDF/XML result in valid 
RDF/XML?

Thanks,
- Dave

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