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Andrea Valassi authored
* Exception thrown when attempting to create an invalid tag relation, * e.g. between the root node and its not-existing parent node * or between two tags with the same name in different nodes. git-svn-id: file:///git/lcgcool.svndb/cool/trunk@16937 4525493e-7705-40b1-a816-d608a930855b
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