[bdbxml] Modifier query

Hi,

I'm trying to do a simple modification query using the 'addAppendStep'
method of the DB XML modifier API. I've used this successfully in the
past, however for a recent implementation, I keep getting this error:

Error: XmlModify::execute: Cannot perform a modification on an XmlValue
that isn't either Node or Document type, errcode = INVALID_VALUE, error
code 0

Does anyone know what this means? The XmlValue which is passed to the
addAppendStep method is a simple well-formed document...I'm not sure why
this isn't working when it has worked before. The errcode =
INVALID_VALUE suggests that XML passed into the addAppendStep is
invalid, but I can't see how as it's a simple well formed instance? Am I
missing something here?

Any advice/help well very appreciated?
Thanks,
Ant




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