PSS — Some others ways to get an abstract storage type reference

At this time, the PSDL mapping does not provide a way to create an object
and to directly get its reference. It means that if you want to have an
abstract storage type reference, you only have to solution :

• to use the _create operation from the storage home ( not very flexible )
• to find an storage type thanks to a find_ref_by_xxx from the abstract
  storage home

I think that the "factory" mapping should be changed :

Currently : ( PSS spec, p 56 )

factory create( accno );

// it's like
// Account create( in string accno )

After changes :

factory create( accno );
<pre>
// it's like
// Account create( in string accno );
// ref<Account> create_ref( in string accno );
</pre>
Moreover, the catalog currently provides : StorageObject find_by_pid( byte
[] pid );

It should be very useful to provide another method : StorageObjectRef
find_ref_by_pid( byte [] pid );

accepted