from
Convert from SCValXdr with the type of SCValTypeXdr.SCV_EXECUTABLE_TAG to String.
The tag bytes are decoded as UTF-8 strictly; a tag that is not valid UTF-8 is read with fromExecutableTagBytes.
Return
the executable tag
Parameters
sc
SCValXdr to convert
Throws
if scVal type is not SCValTypeXdr.SCV_EXECUTABLE_TAG, or if the tag bytes are not valid UTF-8