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<DIV><FONT size=2>Dear Express experts,</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>I would liket to get your recommendation for a particular case
of use of Express2</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>Example:</FONT></DIV>
<DIV>
<P><CODE><FONT size=2> </FONT></P>
<P>TYPE identification_item = EXTENSIBLE SELECT;</P>
<P>END_TYPE;</P>
<P>TYPE alias_identification_item = EXTENSIBLE SELECT BASED ON <A
href="file:///D:/Huau/Modules/XML_reposit/stepmod/data/modules/identification_assignment/sys/4_info_reqs.xml#identification_assignment_arm.identification_item">identification_item</A>;<BR>END_TYPE;
<BR></P>
<P><CODE>ENTITY Alias_identification<BR> SUBTYPE OF (<A
href="file:///D:/Huau/Modules/XML_reposit/stepmod/data/modules/identification_assignment/sys/4_info_reqs.xml#identification_assignment_arm.identification_assignment">Identification_assignment</A>)
; <BR> SELF\Identification_assignment.items : SET [1:?] OF
alias_identification_item;</CODE></P>
<P><CODE></CODE><CODE>END_ENTITY;<BR></P></CODE><CODE><FONT size=2>
<P></P>
<P>ENTITY Identification_assignment;</P>
<P> identifier : STRING;</P>
<P> role : OPTIONAL STRING;</P>
<P> description : OPTIONAL STRING;</P>
<P> items : SET [1:?] OF identification_item;</P>
<P>END_ENTITY;</P></FONT></CODE>
<P><CODE><FONT face=Arial size=2></FONT></CODE> </P>
<P><CODE><FONT face=Arial size=2>My understanding is that the specification of
alias_identification_item involves that:</FONT></CODE></P>
<P><CODE><FONT face=Arial size=2>- all entiy types contained in
identification_item are allowed to get an alias.</FONT></CODE></P>
<P><CODE><FONT face=Arial size=2>- all entity types contained in
alias_identification_item are allowed to get an identification
assigned</FONT></CODE></P>
<P><CODE><FONT face=Arial size=2></FONT></CODE> </P>
<P><CODE><FONT face=Arial size=2>As it may not be suitable that the list of
entities that may get an alias, be a superset of the list of entities that may
get an identification, how to specify the entity alias_identification if
alias_identification_item is no more an extension of identification_item?
</FONT></CODE><CODE><FONT face=Arial size=2>Can alias_identification stay a
subtype of Identification_assignment? (my opinion is No, but I would like a
confirmation from the best experts)</FONT></CODE></P>
<P><CODE><FONT face=Arial size=2></FONT></CODE> </P>
<P></CODE><FONT size=2>Regards,</FONT></P>
<P><FONT size=2>Pascal Huau<BR>Association GOSET<BR>107,111 avenue Georges
Clemenceau<BR>92000 Nanterre<BR>FRANCE</FONT></P></DIV></BODY></HTML>