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Datatypes R2 Issue 67

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Revision as of 12:33, 14 September 2006 by GrahameGrieve (talk | contribs)
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Need to document what the acceptable constraint rules are for datatypes.

This table summarizes the allowable datatype substitutions in designs.

There are two circumstances when one would constrain datatypes:

  1. Modelling-time: as part of the HDF, done by committee or affilliate
  2. Run time: as part of the on the wire format (uses xsi:type) as a constraint of a datatype as used in the serialized model (mostly: the message type)

Run-time dataype constraints

  • ANY can be constrained as below
  • GTS
I've got an R-MIM that has GTS in it (see the ActReference R-MIMs in shared messages) since they reference (are an extract of, a summary of) any random act. This requires run-time subtitution. According to Grahame GTS should not be in the above list, in which case I'd have to change the models to use ANY for effectiveTime and constrain the runtime substitution somehow. I dont really want to do that. Rene spronk 06:45, 14 September 2006 (CDT)
Right. That's an interesting issue. Why does it require run time substitution - what are you thinking this will achieve? And you can't change to ANY

Modelling time datatype constraints

Note that regards to collections, COLL<X> can by constrained to COLL<Y> where Y is a valid constraint on X. Note also the committees can introduce Mixins (UVL, and NPPD) in the models to any attribute (if thy make sense)

The second table is those proposed by Lloyd, but they have no formal basis in the abstract datatypes:


Source Allowed
ANY anything (including mixins?)
BL nothing
BN nothing
ED ST
ST UID
CD CE, CV, CO
CE CV, CO
CV CO
CO nothing
CS nothing
CR nothing
SC nothing
II nothing
TEL nothing
AD nothing
EN PN, ON, TN
PN nothing
TN nothing
ON nothing
QTY TS, MO, REAL, INT, TS, RTO<QTY, QTY>, PQ
INT nothing
REAL INT
RTO nothing
PQ REAL, INT
PQR nothing
MO nothing
TS nothing
SET<T> T
LIST<T> T
GLIST<T> T
SLIST<T> T
BAG<T> T
IVL<T> T
HIST<T> HXIT<T>, T
UVP<T> T
NPPD<T> T
PIVL<T> nothing
EIVL<T> nothing
GTS<T> SET<PIVL<TS>>, SET<EIVL<TS>>
PPD<T> ?
Source Allowed
SC ST
PN TN
ON TN
BAG SET, LIST
PIVL<T> IVL<TS>