Datatypes R2 Issue 67

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

At modelling time I won't know what specilaization of GTS has been used in Acts that I'll be referencing. As such I have to allow for all GTS specializations. The acts I'm referencing are based on various R-MIMs, each may have used a different GTS speclilization at modelling-time. Rene spronk 07:37, 14 September 2006 (CDT)

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>