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RE: [xml-dev] When you create a markup language, what do your parent elements mean? What do your children elements mean?
- From: "David Lee" <dlee@calldei.com>
- To: "'rjelliffe'" <rjelliffe@allette.com.au>, "'Jim Melton'" <jim.melton@oracle.com>
- Date: Sat, 1 Oct 2011 09:03:03 -0400
Nitpicking here but I dont see that 'paragraph has-a CONCEPT'
I see 'paragraph contains-a text item which has-a CONCEPT'
The CONCEPT element to my reading is not an attribute of the paragraph but of the text item "text markup".
Which the paragraph contains.
----------------------------------------
David A. Lee
dlee@calldei.com
http://www.xmlsh.org
-----Original Message-----
From: rjelliffe [mailto:rjelliffe@allette.com.au]
Sent: Saturday, October 01, 2011 3:09 AM
To: Jim Melton
Cc: liam@w3.org; Costello, Roger L.; xml-dev@lists.xml.org
Subject: Re: [xml-dev] When you create a markup language, what do your parent elements mean? What do your children elements mean?
On Thu, 29 Sep 2011 13:29:22 -0600, Jim Melton <jim.melton@oracle.com>
wrote:
> Further to the use of XML parent and child elements for
> representation of documents, I'm surprised that nobody has used the
> following example:
>
> <paragraph>This is a sample paragraph that has some <emphasis
> kind="italics">text markup</emphasis> embedded within it.
> <quote>This
> is a common situation</quote>, said the author.</paragraph>
...
> I don't think that anybody could reasonably claim that the <emphasis>
> child element has any definitive relationship to the <paragraph>
> element other than simple containment. As Liam suggested, this is an
> example of a parent-child relationship that has nothing to do with a
> "has-a" relationship. That is, <emphasis> is not a property of the
> object <paragraph> (and I find referring to <paragraph> as an
> "object"
> not all that helpful anyway, although it's certainly not "wrong" to
> do
> so).
Ah, I think that is because the wrong level of markup is being used to
expose the has-a.
If you said
<paragraph>This is a sample paragraph that has some <CONCEPT
kind="italics">text markup</CONCEPT> embedded within it. <quote>This
is a common situation</quote>, said the author.</paragraph>
then you could certainly say "This paragraph has-a CONCEPT", in the
sense that the
CONCEPT is metadata that reflects some categorizing property attached
to the paragraph.
In that case it happens to be declared inline, but it could be declared
as an attribute too:
<paragraph CONCEPT="text markup">This is a sample paragraph that has
some <emphasis
kind="italics">text markup</emphasis> embedded within it. <quote>This
is a common situation</quote>, said the author.</paragraph>
In other words, if an explicit relationship is intended, then you need
to move away from
generic semi-presentational elements (such as emphasis) to more
specific semi-semantical
element names (such as CONCEPT or keyword etc.)
Otherwise, all you are left with is the raw semantic of tags, that they
delimit ranges of
text.
Cheers
Rick
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