It looks like the scapval tool for version 1.3 is looking for a namespace that is no longer at the original URL.
In my thinking, if the tool is to work, the one of two things should happen.
According to 800-126 r2 and r3, the ds (datastream) namespace should be http://scap.nist.gov/schema/scap/source/1.2
being that it is just an XML namespace it doesn't necessarily have to be an active web URL
It looks like the scapval tool for version 1.3 is looking for a namespace that is no longer at the original URL. In my thinking, if the tool is to work, the one of two things should happen.
[From SCAP-DEV]