[MOBY-l] A simpler Ontology question

[Hudson, Thomas C.]

Here's a simpler question about the ontology I don't understand:
  As far as I can see, the root of the sequence hierarchy is the
VirtualSequence, which is a MOBY object with an integer Length. So
there's no way to have a sequence object without the length attached?

Tom, who has a database that doesn't store length, meaning length is
expensive, and wants to just use accession numbers out of the first
database to do lookups in another database, meaning length is
unnecessary.