ARTICLE
Checking Structures
The operator EXACT can
only be used to convert structures to compatible
structures. Full compatibility is not required for the following
deep components, for which the specified requirements apply:
For components that have a reference type
, up casts but not
down casts are permitted.
For table-like components, it is sufficient if the
row type is compatible. This means that the
full compatibility needed for
table categories and
table keys is not required here.
Notes
When the operator EXACT is used, the
conversion rules for flat structures are the same as those for deep
structures. It is not possible to make conversions between structures
and elementary data objects.
If the structured types are compatible, no further checks are made on
the content. If the source structure contains invalid data, this data is
assigned to a compatible return value, even when the addition EXACT
is used.
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