Automatic creation of PrimitiveTypes Package

Hi,

When the XMI Reader automatically generates the PrimitiveTypes package 
(from a MOF 1.3 model), I think that is should make sure it generates 
the javax.jmi.packagePrefix tag for it. Also, instead of including just 
the datatypes that are actually used by the metamodel, I think it would 
be better to always include all of them. That is, if the XMI Reader adds 
the PrimitiveTypes package, it should always add the XMI equivalent of:

package PrimitiveTypes
{
    tag "*tag" : javax.jmi.packagePrefix = 'javax.jmi' on PrimitiveTypes
    primitive type Boolean
    primitive type Integer
    primitive type Long
    primitive type Float
    primitive type Double
    primitive type String
}

Instead of just, e.g.:

package PrimitiveTypes {
    primitive type String
    primitive type Integer
}

I think it is too confusing to have a different version of the 
PrimitiveTypes package for each metamodel (e.g. some without "Boolean", 
most without "Long", etc.). What do you think?

- Brian