WFC "Entity Declared" vs. VC "Entity Declared" (for GEs, PEs)

I am trying to understand the exact distinction
regarding declaration of entities; specifically, under
which conditions are missing declarations of entities
validity, and under which well-formedness, violations.

Description of these constraints under 4.1 seem bit
unclear; especially regarding difference between
undeclared (or only externally declared) general and
parameter entity references.

Now, it does look like undeclared PEs can only result
in a VC (since [69] does not have WFC). Is this
correct? So that independent of value of 'standalone'
pseudo-attribute, it is only an error (not fatal
error) to encounter an undeclared PE?. Or are there
some cases where an undeclared PE would be considered
a WFC?

Or regarding GEs; are there cases where undeclared GE
would only be a VC? (perhaps if standalone = 'no', and
external subset contains a default attribute
declaration that refers to an [as-of-yet] undeclared
entity?)

-+ Tatu +-


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