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--- 01_user_documentation:07_rgg_xl:02_xl:08_object:02_pattern [2025/08/25 12:35] – gaetan
+++ 01_user_documentation:07_rgg_xl:02_xl:08_object:02_pattern [2025/09/02 18:26] (current) – gaetan
@@ Line 1: / Line 1: @@
 ====== Pattern ======
-Patterns are declared from a class that extends [[https://javadoc.grogra.de/xl/de/grogra/xl/query/UserDefinedPattern.html|UserDefinedPattern]]. Each concrete subclass of UserDefinedPattern declares a user-defined pattern, where the term “user-defined” distinguishes such a pattern from built-in patterns of the XL programming language. The signature (number and types of parameters) of a user-defined pattern is given by a special method named signature which has no further purpose. The @In and @Out annotations in the signature are needed when textually neighboring patterns are connected.
+Patterns are declared from a class that extends [[https://javadoc.grogra.de/xl/de/grogra/xl/query/UserDefinedPattern.html|UserDefinedPattern]]. Each concrete subclass of UserDefinedPattern declares a user-defined pattern, where the term “user-defined” distinguishes such a pattern from built-in patterns of the XL programming language. The signature (number and types of parameters) of a user-defined pattern is given by a special method named signature which has no further purpose. The [[https://javadoc.grogra.de/xl/de/grogra/xl/query/UserDefinedPattern.In.html|@In]] and [[https://javadoc.grogra.de/xl/de/grogra/xl/query/UserDefinedPattern.Out.html|@Out]] annotations in the signature are needed when textually neighboring patterns are connected.
 =====  =====
-The minimal format to declare a pattern as java object is:
-<code java>
+{{namespace>:01_user_documentation:07_rgg_xl:02_xl:08_object:02_pattern}}
-class X extends Node {
-    static class Pattern extends UserDefinedPattern {
-        private static void signature(@In @Out X node) {}
-        public Matcher createMatcher(Graph graph, XBitSet bound,
-             IntList requiredAsBound) {...}
-    }
-}
-</code>
-Additionally, the in RGG, a pattern can be declared and used as:
-<code java>
-// declaration
-class xyzPath(@In Node a, @Out Node b) (
-    a -x-> -y-> -z-> b
-    )
-//usage
-void rule() [ Node -xyzPath-> Node ==>; ]
-</code>
-<color #ed1c24>**Note**: the rgg declaration is describe in Ole manuscript and is defined in the Parser, however, there is no Compiler section for it. Thus, it cannot work.</color>