/usr/include/Inventor/scxml/ is in libcoin80-dev 3.1.4~abc9f50+dfsg1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/Inventor/scxml/ScXML.h
/usr/include/Inventor/scxml/ScXMLAbstractStateElt.h
/usr/include/Inventor/scxml/ScXMLAnchorElt.h
/usr/include/Inventor/scxml/ScXMLAssignElt.h
/usr/include/Inventor/scxml/ScXMLCoinEvaluator.h
/usr/include/Inventor/scxml/ScXMLContentElt.h
/usr/include/Inventor/scxml/ScXMLDataElt.h
/usr/include/Inventor/scxml/ScXMLDataModelElt.h
/usr/include/Inventor/scxml/ScXMLDocument.h
/usr/include/Inventor/scxml/ScXMLECMAScriptEvaluator.h
/usr/include/Inventor/scxml/ScXMLElseElt.h
/usr/include/Inventor/scxml/ScXMLElseIfElt.h
/usr/include/Inventor/scxml/ScXMLElt.h
/usr/include/Inventor/scxml/ScXMLEvaluator.h
/usr/include/Inventor/scxml/ScXMLEvent.h
/usr/include/Inventor/scxml/ScXMLEventElt.h
/usr/include/Inventor/scxml/ScXMLEventTarget.h
/usr/include/Inventor/scxml/ScXMLExecutableElt.h
/usr/include/Inventor/scxml/ScXMLFinalElt.h
/usr/include/Inventor/scxml/ScXMLFinalizeElt.h
/usr/include/Inventor/scxml/ScXMLHistoryElt.h
/usr/include/Inventor/scxml/ScXMLIfElt.h
/usr/include/Inventor/scxml/ScXMLInitialElt.h
/usr/include/Inventor/scxml/ScXMLInvokeElt.h
/usr/include/Inventor/scxml/ScXMLLogElt.h
/usr/include/Inventor/scxml/ScXMLMinimumEvaluator.h
/usr/include/Inventor/scxml/ScXMLObject.h
/usr/include/Inventor/scxml/ScXMLOnEntryElt.h
/usr/include/Inventor/scxml/ScXMLOnExitElt.h
/usr/include/Inventor/scxml/ScXMLParallelElt.h
/usr/include/Inventor/scxml/ScXMLParamElt.h
/usr/include/Inventor/scxml/ScXMLScriptElt.h
/usr/include/Inventor/scxml/ScXMLScxmlElt.h
/usr/include/Inventor/scxml/ScXMLSendElt.h
/usr/include/Inventor/scxml/ScXMLStateElt.h
/usr/include/Inventor/scxml/ScXMLStateMachine.h
/usr/include/Inventor/scxml/ScXMLSubObject.h
/usr/include/Inventor/scxml/ScXMLTransitionElt.h
/usr/include/Inventor/scxml/ScXMLValidateElt.h
/usr/include/Inventor/scxml/ScXMLXPathEvaluator.h
/usr/include/Inventor/scxml/SoScXMLEvent.h
/usr/include/Inventor/scxml/SoScXMLStateMachine.h