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"since <constraintSpec> can appear as a child of <schemaSpec>, it should also appear as part of <specGrp>" (Rahtz)
implemented by [r12901].
Checked against http://bits.nsms.ox.ac.uk:8080/jenkins/job/TEIP5/lastSuccessfulBuild/artifact/release/xml/tei/custom/schema/relaxng/tei_all.rng
--> works for me