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Re: The privilege of XML parsing - Data types, binary XML and

  • To: xml-dev@l...
  • Subject: Re: The privilege of XML parsing - Data types, binary XML and XMLpipelines (LONG)
  • From: Sean McGrath <sean.mcgrath@p...>
  • Date: Mon, 09 Dec 2002 18:49:22 +0000

parsing data
Hi Roger,

 >I am not clear on what you are saying.  Consider this:

 >    <elevation>12000</elevation>

 >Suppose that I create a schema for the aircraft and elevation elements.
 > declare that the elevation element should hold an integer that is
 >restricted to a range of 0 - 20000.  Thus, the schema is defining a
 >"data model".  Are you saying that such a data model is bad, that there
 >should be no such model and it should be up to applications to interpret
 >the data?  Thus, one application may interpret 12000 as an integer,
 >another may interpret it as a string, another may interpret it as still
 >something else?

 >Isn't a data model a contract between the sender and the receiver?  If
 >we have agreed to this contract then we can effectively communicate,

In my experience:

1. the amount of useful contract stuff that you can
enshrine in any declarative syntax is a lot less that many people

2. The amount of concrete shared datatypes that can be enshrined
without getting into platform/application specific datatypes is

Having said that, I am not averse to data types. I'm averse to them
being in the core where they infect everyone whether your like
it or not. I'm advocating the use of a pipelined parsing paradigm
in which datatype ornamentation of the tree is cleanly separated
from the tree itself.




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