[xml] Strange behaviour in ID type attributes

I've defined a DTD, where there's defined an element with some attributes,
one of them being a CDATA one, another a ID one. The DTD encoding is

When I create a document conforming to this DTD, and put a ISO-8859-1 string
(ie, with accentued characters), as the value of the CDATA attribute
mentioned above, all goes well. The problem is when I do the same with the
ID attribute: if I try to validate the document, setting xmlDoValidityCheckingDefaultValue 
to '1', I receive this error message:

"validity error: Syntax of value for attribute my_attr on my_element is not valid 
<my_element my_attr="Anímals">" 
(being the original value in this example "Anímals". Looks like libxml2 doesn't convert 
back the internal UTF-8 string for the attribute value to the original ISO-8859-1 one 
before printing the error message (?))

I've read the XML spec, and as far as I understand it, there's no constraint
in ID attributes about being ASCII-only, but I could be wrong...

Please, is this behaviour because a bug in libxml2? or am I loosing
something? if is really a bug, are there some plans to fix it?

Thank you.

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