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--- 01_user_documentation:07_rgg_xl:02_xl:05_rule [2025/09/04 12:26] – ↷ Links adapted because of a move operation gaetan
+++ 01_user_documentation:07_rgg_xl:02_xl:05_rule [2025/09/04 12:34] (current) – gaetan
@@ Line 2: / Line 2: @@
 ====== Rule ======
-This section present graph rules.
+In order to combine queries and production statements to rules, the XL programming language defines three arrow symbols ''%%==>%%'', ''%%==>>%%'' and ''%%::>%%''. The first two are ''structural rules'' whose
+right-hand sides consist of production statements which define a successor graph. The third one is an ''execution rule'' which executes the statement for every match.
+Additionally, rules using ''%%==>%%'' extend rules using ''%%==>>%%'' by implicit connection transformations. I.e. with ''%%==>%%'' we can write L-system rules just as we would do this in an L-system environment.
 ====== ======