Thomas Beale <thomas.beale at oceaninformatics.com> wrote: > On 20/09/2013 12:01, Diego Bosc? wrote: >> ... >> There is even an invariant defined as "Archetype_node_id_valid: >> archetype_node_id /= Void and then not archetype_node_id.is_empty" >> How does this work in your current implementations when sometimes the atxxxx >> code is not present? > > it's simpler than you think - we made that property mandatory so that > programmers would never get a null exception. If it doesn't contain an > at-code or an archetype id, it can be empty (but not null), or (what the ADL > workbench currently does) - it can contain a dummy id like 'unknown' that the > software can easily spot and strip out.
I think it has to be the dummy id. According to the invariant, it can't be empty. Peter
