Re: [xsl] modeling relationships for efficent XSL processing

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2004-02-26 07:13 -0800, James A. Robinson wrote:
> So I've got databases which don't depend on anything, features which
> depend on a database type, and sites which depend on features and the
> specific database of the type required by the each feature. I find myself
> wanting to model things using XPATH notation:

But just how flexible do you need these XPath addresses to be?

>     <require_db 
> xpath="/dbservers/dbserver/dbname/schema[@name='subscriber_db']"

Could you say:

  <require_db schema="subscriber_db"/>

and then within the handling of require_db hardwire the rest of the XPath:

  <xsl:value-of
      select="/dbservers/dbserver/dbname/schema[@name=current()/@schema]"/>

>     <ref_database 
> xpath="/dbservers/dbserver[@name='oracle1']/dbname[@name='wsj_subscribers']"/>

Could you say:

  <ref_database dbserver="oracle1" dbname="wsj_subscribers"/>

and then within the handling of ref_database hardwire the rest of the XPath:

  <xsl:value-of select="/dbservers/dbserver[@name=current()/@dbserver]/
                        /dbname[@name=current()/@dbname]"/>

That way you would have an element type for each of your (I suspect limited 
set of) possible XPath hardwired addresses where the soft components needed 
for lookup are supplied as attributes of the element.

But it would only work if you did, indeed, have a limited set of possible 
XPaths and it was not totally generalizable.

I hope this helps.

........................ Ken


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