SNP — translation rules should be better documented

The use of UML to describe the conceptual model in UML (i.e PIM)
and the data interchange model in XML Schema (i.e PSM) is good. It
would be better if the translation rules are better documented (some
of this is listed, but others are hidden in the tool implementation
that is used to produce the schema).

Discussion:

At the monent we see two alternatives. Both of them, however, need
first to solve the issue with UML tools interoperability (see above,
number 1). They are:

a) Keep the current way of transformation from the XMI to the XML
Schema but:
i) Better document the rules used in the manual translation from
the XMI to the Excel spreadsheet, and
ii) Make available the software tool used to transform the Excel
spreadsheet to the final XML Schema.

b) Write (and make available, including reasonable documentation) a
new tool that would transform directly from the XMI to XML Schema.

Actually, there is also the third way. We will use it if the resulting
XMI (coming from the new version of Umbrello 1.4) is too different
from the current XMI. In that case, we remove from the specification
the description how to get from the XMI to XML Schema completely, and
we will only keep there a statemant that that both XMI and XML Schema
are normative.

Proposed solution:

none yet

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