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Hi John,
> There's a confusion of levels lurking here. An infoset may be
> represented in two different ways: as the native XML from which it
> was derived, or with some other representation particular to
> infosets. This latter may or may not be an application of XML.
Thank you for articulating it like that! This is what I've been trying
to say about LMNL -- you can represent a LMNL data model / infoset in
a "native" form, as LMNL syntax, or with some other representation
peculiar to the LMNL data model. The latter may or may not be an
application of LMNL. We have, though, defined a standard "reified LMNL
layer", which is an application of LMNL that represents a LMNL data
model (and a few other things that are useful in LMNL syntax).
> The first representation has the advantage that it is simple and
> clear; it has the disadvantage that it cannot in general represent
> infosets that contain non-standard item types or properties. The
> second representation is generally quite opaque, but has the
> advantage that it can easily be extended to represent enhanced
> infosets.
>
> SLAIX is a general-purpose representation of infosets that has the
> advantages of uniformity, extreme extensibility, and being an
> application of XML. Its disadvantages are that it is verbose,
> grotesque, and unreadable. See
> http://lists.xml.org/archives/xml-dev/200208/msg00875.html
Having a short, elegant and readable representation for moving around
augmented Infosets was one my primary reasons for pursuing LMNL.
In LMNL syntax, the Infoset represented by the XML document:
<book>
<author sort="brownjohn">John Brown</author>
<title>My Life</title>
</book>
would look like:
[book}
[author [sort}brownjohn{]}John Brown{author]
[title}My Life{title]
{book]
If you wanted to augument this infoset, for example to say that the
xsi:type of the [sort] annotation was xs:token, you could do that by
adding an annotation to the [sort] annotation:
[!ns xsi="http://www.w3.org/2001/XMLSchema-instance";]
[book}
[author [sort [xsi:type}xs:token{]}brownjohn{]}John Brown{author]
[title}My Life{title]
{book]
Cheers,
Jeni
---
Jeni Tennison
http://www.jenitennison.com/
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