| <p><code>List of <i>features</i>. Default is the empty list.</code></p> | |
| <p><i>Features</i> on a rule modify the <i>features</i> currently enabled on | |
| the <a href="${link package}">package</a> level via the <i>features</i> attribute.<br/> | |
| For example, if the features ['a', 'b'] are enabled on the package level, | |
| and a rule <i>features</i> attribute contains ['-a', 'c'], the features | |
| enabled for the rule will be 'b' and 'c'. | |
| </p> | |