Github user alpinegizmo commented on a diff in the pull request:
https://github.com/apache/flink/pull/4041#discussion_r119885420
--- Diff: docs/dev/libs/cep.md ---
@@ -246,63 +334,399 @@ pattern.where(event => ... /* some condition
*/).or(event => ... /* or condition
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-Next, we can append further states to detect complex patterns.
-We can control the contiguity of two succeeding events to be accepted by
the pattern.
+##### Conditions on Contiguity
-Strict contiguity means that two matching events have to be directly the
one after the other.
-This means that no other events can occur in between.
-A strict contiguity pattern state can be created via the `next` method.
+FlinkCEP supports the following forms of contiguity between events:
+
+ 1. Strict Contiguity: which expects all matching events to appear
strictly the one after the other,
+ without any non-matching events in-between.
+
+ 2. Relaxed Contiguity: which simply ignores non-matching events appearing
in-between the matching ones.
+
+ 3. Non-Deterministic Relaxed Contiguity: which further relaxes contiguity
by also creating alternative
+ matches which ignore also matching events.
--- End diff --
Non-Deterministic Relaxed Contiguity is hard to understand. Maybe this is
clearer:
... which further relaxes contiguity, allowing additional matches that
ignore some matching events.
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