Talk:Modifying an existing level: Difference between revisions

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 =====Roundtripping=====
-Descriptors IDs like in <code><TRAC id="6787"></code> are not preserved (because irrelevant) and will be resetted to 0.
+* On a general note: Round-tripping data is a very effective method to detect observable differences and actual bugs.
+* More specifically: Descriptor IDs, such as in <code><TRAC id="6787"></code>, are not preserved because ONI files use ''local'' IDs and are later repacked during DAT creation. Therefore, IDs in XML/ONI are typically reset to 0.
+** Therefore, you can define hash parity of output files as a general goal, with the exception that differences can be ignored if they are caused only by non-semantic ID changes. In other words: you may consider semantic equivalence under normalized comparison as sufficient.
+** By the way, DAE files - which are internally XML - contain a tag for the authoring tool and version. Therefore, these files may also differ at the byte level.
 =====Agent.md example=====