XML is whitespace sensitive in some grammar productions.

[bd82]

Apparently whitespace cannot be freely used everywhere, examples:

• https://www.w3.org/TR/REC-xml/#sec-starttags
• between < and Name
• around the Eq of an attribute.

So @xml-tools/parser is not exposing the correct syntax errors in this case.
But on the other hand this parser is fault tolerant and should be able to handle small syntax errors
such as these transparently.

The solution would likely be to manually perform checks for redundant during parsing.
and save a custom syntax error message if such WS was encountered.
These syntax errors should not affect the regular parsing flow.