CORBA21 — Correct CDR encoding of an empty string

Summary: What is the correct encoding for an empty string according to GIOP?

In section 13.3.2, page 13-11 of CORBA 2.2, the following paragraph
describes the encoding of strings:

"A string is encoded as an unsigned long indicating the length of the string
in octets, followed by the string value in single- or multi-byte form
represented as a sequence of octets. Both the string length and contents
include a terminating null."

This does not clarify what is the correct encoding for empty strings,
as there are two possibilities:
a) length=0, no string follows
b) length=1, "\0" (one-char with the terminating null)

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