Access Languages are Tied to Schemas

Jonathan Robie jwrobie at
Fri Nov 21 02:07:10 GMT 1997

At 12:53 PM 11/21/97 +1100, Rick Jelliffe wrote:
>> From: Jonathan Robie <jwrobie at>
>> The following properties of object models are easily represented in SGML/XML:
>> o       Identity
>> o       State
>> o       Type
>> These properties are not easily represented:
>> o       Behavior (except for in languages that allow methods to be
>> represented as data, e.g. Java)
>> o       Encapsulation constraints
>I think you miss what is perhaps *THE* most important thing that SGML content
>models represent:  sequence.
>This is one of the essential distinguishing features of SGML.
The purpose of my message was to describe what SGML/XML-based interfaces to
object systems can represent, not to propose that SGML/XML should have the
same inheritance mechanisms as object oriented systems. Whether or not they
should, I think it is pretty clear that they don't.


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