The SCA$QUERY_GET_ATTRIBUTE routine gets a handle to an attribute
of an entity.
If the iteration_context parameter is not specified, then
this routine finds the first attribute of the specified kind
(attribute_kind) and updates attribute_handle to describe that
attribute.
In general, several attributes can be associated with a particular
entity. With this routine you can find all of those attributes by
using the iteration_context parameter.
This routine will become obsolete in a future version of SCA. The
SCA$GET_ATTRIBUTE routine supersedes this routine.