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Update release notes, refs #2354

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Clément Fournier
2020-03-20 14:46:21 +01:00
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docs/pages/release_notes.md
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@ -14,6 +14,24 @@ This is a {{ site.pmd.release_type }} release.
### New and noteworthy
#### Performance improvements for XPath 2.0 rules
XPath rules written with XPath 2.0 now support conversion to a rulechain rule, which
improves their performance. The rulechain is a mechanism that allows several rules
to be executed in a single tree traversal. Conversion to the rulechain is possible if
your XPath expression looks like `//someNode/... | //someOtherNode/... | ...`, that
is, a union of one or more path expressions that start with `//`. Instead of traversing
the whole tree once per path expression (and per rule), a single traversal executes all
rules in your ruleset as needed.
This conversion is performed automatically and cannot be disabled. *The conversion should
not change the result of your rules*, if it does, please report a bug at https://github.com/pmd/pmd/issues
Note that XPath 1.0 support, the default XPath version, is deprecated since PMD 6.22.0.
**We highly recommend that you upgrade your rules to XPath 2.0**. Please refer to the [migration guide](https://pmd.github.io/latest/pmd_userdocs_extending_writing_xpath_rules.html#migrating-from-10-to-20).
### Fixed Issues
### API Changes