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   Re: XML Link Questions

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  • From: Peter Murray-Rust <peter@ursus.demon.co.uk>
  • To: xml-dev@ic.ac.uk
  • Date: Wed, 29 Oct 1997 10:25:22

Since you have had no public replies, I'll add my 2p. I am, like you, a
consumer of XLL and not an author, so I'm prepared to be shot down.

At 17:18 26/10/97 +0000, Neil Bradley wrote:
>Having read the XML Link specification, I have a few questions.
>In both the XML Language and XML Link schemes, a target element can 
>be identified by its ID value. Is it possible using XML Link to 
>target an element in a document that does not have a DTD, and if so, 
>how is the target attribute identified, by a fixed attribute name 
>of 'Id'?

I think this can be done through the internal DTD subset. it DOES mean that
the parser has to act on the internal subset, but it needn't be validating.


will force all FOO's to have BAR attributes (if validated). It will also
say to the non-validating parser 'if you find a <FOO BAR="baz"> then the
BAR is of type ID whether you have an external DTD or not.
>Does STRING(1,'testing',0) only select the first character of 
>'testing', or the whole word. If the first character, can DITTO() be 

XLL has no concept of words (it doesn't know what whitespace is). The only
two alternatives are:
	- to select a character
	- to position an inter-character 'cursor'
I suspect the former would get most votes.
	Note that to highlight using pure XLL would require '..' at present. I
would write:
to highlight the word 'jim'

Is this how other see it?

>used to specify a range from 't' to 'g', and is DITTO() assumed to 
>start from the enclosing element or from the first character of 
>testing, in which case can DITTO() actually find it?
>What impact does case-sensitivity have on the default and replacement 
>attribute names and values. Is 'HREF' or 'href' the default resource 
>locator name, and must 'XML-ATTRIBUTES' (or 'xml-attributes') contain 

This is a very important question. I have asked it on XML-SIG - we'll see
what the gurus think. It is now legal to write:
<FOO HREF="a.xml" href="b.xml" Href="c.xml">

Inconsistency in examples of XML is rife :-) We need this cleared up quickly.

>case-sensitive values ('HREF TARGET TITLE REFTITLE' or 'href target 
>title RefTitle').


BTW it has been very quiet about XLL for the last 2 months or so. Is anyone
other than me implementing the draft?


Peter Murray-Rust, Director Virtual School of Molecular Sciences, domestic
net connection
VSMS http://www.nottingham.ac.uk/vsms, Virtual Hyperglossary

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