Query Languages for XML

Paul Prescod papresco at technologist.com
Sat Nov 15 19:58:35 GMT 1997

Richard Light wrote:
> Obviously this is not just an XML problem: it applies equally to SGML,
> which is in effect a "read only" standard.  One example of this is in
> the style language's (DSSSL or XSL) online support.  As far as I am
> aware, there is no support for any features of forms.  

I do not believe that this is true. As I understand it, you can create a
"HTML form element" flow object and an "HTML input element" flow object
within it.

> Yet, if SDQL had
> primitives such as (insert-node), (replace-node) and (add-text-to-node)
> it wouldn't be too hard to add an "input-line" flow object type.  

DSSSL has no provisions for adding flow object types in DSSSL code. So
we are essentially talking about the DSSSL implementation language (Java
or C, probably) It is as easy in these languages to define and implement
an "input field" flow object as it is to make a "hyperlink" flow object.
There is no need to extend SDQL. The input text does not have to be part
of the flow object tree. The "input text" flow object can handle the
interactivity just as the "hyperlink" flow object does.

 Paul Prescod

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