That is where things get interesting, isn't it? In Java, there is a
Class class that can be used to create objects of a class that might
not be known at compile time (useful, for example, when loading
plugins, JDDBC drivers, etc.) but that's the extent of it. The class
needs to be statically defined somewhere. It would be nice, for
example, to be able to take an XML schema, parse it and create a new
class at runtime so that documents adhering to that schema can be
treated as objects of the given class. In creating my HL7 message
builder, I had to store message bindings as XML documents that would
either be parsed at runtime (the part I did implement) or used to
generate MUMPS code (the part I have not, yet at least, implemented).
Now, if we could generate new "DDs" (as opposed to just storing
something like a DD in an ordinary file), then support for new HL7
messages could be added much more easily without havbing to create
new files. In fact, in my firs "cut" at creating an HL7 query tool, I
actually did create two files to support different HL7 queries. the
message structure was the same in each cse, but the association
between HL7 field and database fields was not. The idea of having a
separate file for every mapping you might want to support was, well,
ludicrous. That's why I rewrote the tools using XML templates and re-
implemented my existing queries using a generic tool (even if it did
require parsing the XML template at runtime, which is a pain in the
neck.)
===
Gregory Woodhouse
[EMAIL PROTECTED]
"The most profound technologies are those that disappear."
--Mark Weiser
On Jul 11, 2005, at 3:32 PM, [EMAIL PROTECTED] wrote:
Perhaps if we had an API call, we would be able
to over-ride it and make dynamic fields etc....
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