Re: Schema.org property cardinality and use of plural (WAS Re: SoftwareApplication proposal for schema.org)

Hi Martin,
I *completely *agree with your view. As I said before the only thing is 
what it will happen when some content creators will not do this.
In addition, the same issue (indeed restricted to values following some 
patterns) comes with multiple values in @itemprop attribute.

Let me summarize:
Some people will do better markup as you suggest. By consequence  two 
triples will be created (corresponding to the two OS in the example).
Some people will not do this but rather by mistake they will annotate as 
I suggested. In this case just one triple will be  created?

Yours,
- Adrian

On 2/29/2012 9:23 AM, Martin Hepp wrote:
> Hi Adrian, all:
>
> I really, really think it is a bad idea to model multiple values for the same property by using delimiters inside a single element. This would basically re-introduce all the problems that delimiter-based data exchange (e.g. CSV files) had and that markup-based representations (XML, HTML,...) had overcome. So I would strongly suggest to use this pattern:
>
> <div itemscope="" itemtype="http://schema.org/SoftwareApplication">
>    <p itemprop="operatingSystems">OSX 10.6</p>,
>    <p itemprop="operatingSystems">Windows 7</p>
> ...
> </div>
>
> or, if you cannot reuse the visible content for some reasons
> <div itemscope="" itemtype="http://schema.org/SoftwareApplication">
>    <p>OSX 10.6, Windows 7</p>
>    <meta itemprop="operatingSystems" content="OSX 10.6">
>    <meta itemprop="operatingSystems" content="Windows 7">
> ...
> </div>
>
> Note that, afaik, meta can live without a closing</meta>  tag in HTML5.
>
> Martin
>
> On Feb 29, 2012, at 9:07 AM, Adrian Giurca wrote:
>
>> Hello Henry,
>> I would say space will be the token separator :)  (a bad result) But, in this context, the main problem is not how to extract triples but what  content creators really do.
>> I am confident that a non-trivial schema processor (extractor) will do more than simple DOM parsing.
>>
>> -Adrian Giurca
>> On 2/28/2012 7:56 PM, Henry Andrews wrote:
>>> With the caveat that I'm new here and probably don't know what I'm talking about, this plural/list usage does not look like a good idea, as it requires anyone who wants to make use of the data to understand that it needs to parse and split on the comma.  Which is easy enough in this example but can become very complex in terms of quoting and escaping, at which point people are likely to write things improperly quoted/escaped making the data worthless.  It's much much easier to say that all formatting/parsing should be handled by the actual markup syntax (in this case HTML) and values are treated as-is.
>>>
>>> I guess this would make for more verbose HTML markup as you'd need to wrap each OS in a<span itemprop="operatingSystem"></span>, but I think it's much more clean.
>>>
>>> thanks,
>>> -henry
>>>
>>> From: Adrian Giurca<giurca@tu-cottbus.de>
>>> Subject: Re: Schema.org property cardinality and use of plural (WAS Re: SoftwareApplication proposal for schema.org)
>>>
>>> When Text is expected I would say that both string and distinct markup should be allowed. Asa such the below may work too:
>>> <div itemscope="" itemtype="http://schema.org/SoftwareApplication">
>>>    <p itemprop="operatingSystems">OSX 10.6, Windows 7</p>
>>> ...
>>> </div>
>>>
>>> and a potential Schema processor should be advised. Of course, this can solved much better  by introducing cardinalities on Schema.org
>>> Introducing cardinalities will not put any pressure on possible existent Schema.org consumers.
>>> However, one should be advised that object oriented software design has a long tradition on using plural to introduce collections of things.
>>>
>>> -Adrian  Giurca
>>>
>> -- 
>> - Adrian
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