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Reproduced in build 070206. To reproduce the bug: - create a new XSLT project; - add 2 new schemas of PO structure; - create an XSL transformation file; - open it in Mapper; - put 'equal' function on canvas; - bind inputs of the function to some elements of the source tree. Notice that the document doesn't mark 'modified'. If you close/reopen the dcument, these changes will be lost.
All expressions, which are not a part of XSL document are not saved when mapper restarts. Expression is beeing added to XSLT document when you connect it to some node in right tree. Its a kind of fundamental mapper problem and we have no idea how to deal with it. At least in beta release. You can check BPEL mapper - it have the same bug.
Can consider like future feature