Hi, Attached are two patches to address some of the problems in the if-then branch. - rule_index_v1.patch: This changes the index so that the example posted here works: http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2017q1/026311.html I guess it will have a small impact on performance because it is likely that more rules are evaluated. - if-then-reader-v1.patch This addresses the problems posted here: http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2017q1/026290.html The unpatched code created a new ExpressionReader for the expressions in the if statement instead of using the existing one. As a result, the getUsedTags() method did not return all used tags. Gerd