[sv-bc] Query regarding built-in package

Hi,

In LRM section 8.10.1, there is a statement like

"/declarations in the built-in package are directly available in any 
other scope (like system tasks and functions)
unless they are redefined by user code.

built_in_data_type ::= [ std:: ] data_type_identifier
built_in_function_call ::= [ std:: ] built_in_identifier"/


I can't really map the verse with the BNF given. The classes inside can 
std can be written again in source file.
In that case /$std::  /can be used to disambiguate. But is it possible 
to use syntax like above? If yes, what does
it semantically mean?


Thanks
Arnab



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