Of course there is a limit, but it might at least be useful to support

* read-expressions containing database-supplied functions (e.g.
count() ) possibly working on multiple columns

* write-expressions containing multiple fields of the same class
descriptor and/or columns

Don't know where to put the limit, so how about supporting simple
expressions for now, where variables like $FirstName are resolved
against the current class descriptor which leads to the expansion into
a (aliased) column name, and the resulting string is used as-is in the
select/insert/update statement ?

Tom

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