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[incubator-kie-issues-803] Add an explanation of semicolon as OOPath … #5829

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Apr 8, 2024
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[incubator-kie-issues-803] Add an explanation of semicolon as OOPath … #5829

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19 changes: 19 additions & 0 deletions drools-docs/src/modules/ROOT/pages/language-reference/_drl-rules.adoc
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Expand Up @@ -1347,6 +1347,25 @@ You cannot embed a comma operator in a composite constraint expression, such as
/persons[ ( age > 50 && weight > 80 ) || height > 2 ]
----

[NOTE]
====
When you write multiple OOPath lines
[source]
----
when
/persons[ age == "10" ]
/addresses[ city == "London" ]
----
Before {PRODUCT} 10, they were concatenated to one line `/persons[ age == "10" ]/addresses[ city == "London" ]`. To avoid that, you need to explicitly use a semicolon `;` to separate the OOPath lines.
[source]
----
when
/persons[ age == "10" ];
/addresses[ city == "London" ];
----
Since {PRODUCT} 10, {PRODUCT} considers the new line as a separator between OOPath lines. So the semicolon is not required.
====

=== Bound variables in patterns and constraints

You can bind variables to OOPath expressions of patterns and constraints to refer to matched objects in other portions of a rule. Bound variables can help you define rules more efficiently or more consistently with how you annotate facts in your data model.
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