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From: Michael Kay <mike@s...>
To: "Costello, Roger L." <costello@m...>
Date: Tue, 27 Sep 2016 12:41:05 +0100

As I look through the XML Schema specification I see no UML diagrams.

As I look through the GML specification I see many UML diagrams.

Are UML diagrams not relevant/useful for data models in the first sense? Are UML diagrams only relevant/useful for data models in the second sense?

I suspect that the kind of people who define models like the XML schema model and the relational model are more comfortable with maths and legalese English than with pictures. So I think it tells you more about the psychology of the individuals concerned than anything else.

Michael Kay

Saxonica

Follow-Ups:
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  - From: Jim Melton <jim.melton@o...>
- =?UTF-8?B?UmU6IFt4bWwtZGV2XSBXaGF0IGlzIGEg4oCcZGF0YSBtb2RlbOKAnT8=?=
  - From: Ihe Onwuka <ihe.onwuka@g...>

References:
- What is a “data model”?
  - From: "Costello, Roger L." <costello@m...>
- =?utf-8?Q?Re=3A_=5Bxml-dev=5D_What_is_a_=E2=80=9Cdata_model?==?utf-8?Q?=E2=80=9D=3F?=
  - From: Michael Kay <mike@s...>
- =?UTF-8?Q?Re:__What_is_a_=e2=80=9cdata_model=e2=80=9d=3f?=
  - From: Jim Melton <jim.melton@o...>
- =?utf-8?Q?Re=3A_=5Bxml-dev=5D_What_is_a_=E2=80=9Cdata_model?==?utf-8?Q?=E2=80=9D=3F?=
  - From: Michael Kay <mike@s...>
- RE: What is a “data model”?
  - From: "Costello, Roger L." <costello@m...>

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