Is an oe ligature okay in the value of dfdl:initiator?

[Costello, Roger L.]

Hello DFDL community,

Here’s my input file (notice the œ ligature):

Lecœur Hello, world

Lecœur is the initiator.

Here’s my DFDL schema:

<xs:element     name="input"
                        type="xs:string"
                        dfdl:initiator="Lecœur"
                        dfdl:encoding="ISO-8859-1"/>

Running it yields this error message:

[error] Parse Error: Initiator 'Lec?ur' not found

Why am I getting this error message?

/Roger