OpenSP with the "-wxml" switch does not complain about
whitespace preceeding the prolog or document element.
According to Production #1 of the XML 1.0SE
Recommendation, and it's decomposition, whitespace is
not allowed before the Prolog. (The UNICODE BOM is an
exception; it's an encoding signature and not part of
the data stream).
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Per http://openjade.sourceforge.net/doc/xml.htm this is a
known limitation. As you know, it's unlikely that anyone
will work on this, so this is really a feature request to
remove some known limitation...