Copied from https://svn.code.sf.net/p/ambit/code/trunk/ambit2-all/ambit2-descriptors/src/main/java/ambit2/descriptors/ (rev 5836)

Change-Id: I878f3987c7f2c6cf5dbd83214b68020709456a18
Signed-off-by: Egon Willighagen <egonw@users.sourceforge.net>