MOF2I2 — Translation between EMOF and CMOF in MOF 2.0

I am reading the "Meta Object Facility (MOF) 2.0 Core Specification"
document ptc/03-10-04. In the section about EMOF, there is the statement
"The value of Essential MOF is that it provides a straightforward
framework for mapping MOF models to
implementations such as JMI and XMI for simple metamodels." From that
statement, I inferred that the reason that EMOF exists is largely to
define XMI 2.0 and (hypothetically) JMI 2.0. In particular, it seemed
from reading the EMOF introduction that the XMI 2.0 and JMI 2.0
specifications would depend only on EMOF (and NOT depend on CMOF).

However, when I read the XMI 2.0 spec., it specifically provides
mappings for features in CMOF that aren't in EMOF, so
implementing/understanding EMOF is not enough to implement/understand
XMI 2.0. There is no JMI 2.0 specification yet, but it seems likely that
the case would be the same as with XMI 2.0. Therefore, it is not clear
to me what the purpose of EMOF is. When is using EMOF more appropriate
than using CMOF?

Are there any examples of complete EMOF models? In particular, does
anybody have the EMOF model defined as an instance of itself, as an XMI
document? I could only find the EMOF model defined as an instance of
CMOF. And finally, is it possible to represent the (merged) CMOF model
as an instance of the EMOF model (useful for bootstrapping)?

Finally, is there a well-defined mapping between EMOF and CMOF? That is,
how can I convert an instance of the EMOF model to an instance of the
CMOF model, and vice versa?

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