The XSLT Support comes with a few intentions that can be useful for XSLT development.
Intention to convert xsl:if to xsl:choose
This is useful if it turns out that a simple if-branch isn't enough in a certain situation and an else-branch is required. When positioning the caret on the start tag of the xsl:if, the intention shows up and converts the code fragment into an xsl:choose, preserving the original xsl:if as an xsl:when block and adding an xsl:otherwise block.
Intention to add optional parameters
This intention can be used to pass a value for an optional parameter in a template-call. It will insert the appropriate xsl:with-param tag and show a lookup list for all parameters that aren't already passed to the template.