# XSL Rules

Index of all built-in rules available for XSL
Table of Contents

## Code Style

Rules which enforce a specific coding style.

- UseConcatOnce: The XPath concat() functions accepts as many arguments as required so you can have "concat($a,’b’…

## Performance

Rules that flag suboptimal code.

- AvoidAxisNavigation: Avoid using the ‘following’ or ‘preceding’ axes whenever possible, as these can cut through 100% …

Tags: rule_references