|
The SEDRIS Data Representation Model
APPENDIX B - Constraints Property Meaning Restrictions |
|---|
For a <Property> instance P (that is, an instance of one of the concrete subclasses of <Property>), the following conditions shall hold.
If P is an instance of <Property Value>, its value. value_type shall be consistent with the restrictions imposed by the meaning of P.
If P is an instance of <Table Property Description>, its value_type and those of the corresponding elements of any applicable <Data Table> instances shall be consistent with the restrictions imposed by the meaning of P.
If P specifies a real-valued EA or real-valued SE_Variable_Code M as its meaning, the value_unit of P shall specify a unit belonging to the EDCS Unit Equivalence Class to which M is bound.
If P does not specify a real-valued EA or real-valued SE_Variable_Code as its meaning, the value_unit and value_scale of P shall be set to EUC_UNITLESS and ESC_UNI, respectively.
The data type and unit of measure shall be semantically valid for the meaning of the <Property>.
Consider a <Property Value> instance
P specifying a numeric meaning, (in this example,
EAC_WIDTH). To be semantically valid, the
value_type of P's
value shall be compatible with
the abstract value type bound to EAC_WIDTH (REAL),
and the value_unit shall be a
member of
No FAQs supplied.
|