The files in "spec/" are taken from:

https://github.com/shexSpec/shexTest.git

under the W3C Software and Document License.
https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document
https://github.com/shexSpec/shexTest/blob/main/LICENSE

spec/syntax : all the *.shex files from shexSpec/schemas
spec/negativeSyntax : all the *.shex files from shexSpec/schemas

spec/negativeStructure : parser requirements
  Remove Makefile.

spec/schemas (one level only - other seem to be support/work-in-progress

spec/validation
   manifest.ttl has the @base commented out
