Question about iop test of c14n

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Hi,
   I'm refacotoring the c14n and i see that i can get some minor 
speed-ups, but I have found something strange. It is this vector correct?
xml-security/data/interop/c14n/Y4/c14n-24.txt

It isn't a valid xml file, I'm missing something?

Perhaps i need to read better the recomendation. But any explanation is 
good.