When NonBP/design-build-test-learn.xml is round tripped it adds the following info which is normally does not exist.
<http://sys-bio.org/Attachment_characterization_protocol/1.0.0> <http://sbols.org/v2#source> <file:///Users/............/..../SBOL-Converter/sbol-converter/output/SBOLTestSuite_conversion/SBOL2_bp/dynamic_measurement.mdx> .