• VSCode Version: Insiders 1.15.0-insider
• OS Version: Windows 10

Steps to Reproduce:

1. Make an XSL file with a basic XML structure
2. Type 'wh' + tab, it incorrectly expands to '<wh></wh>'
3. Set "emmet.useNewEmmet":false in preferences
4. Type 'wh' + tab in the XSL file... it expands (correctly) to: '<xsl:when test=""></xsl:when>'

Same for other xsl emmet extensions.

'if' expands to '<if>', but should expand to '<xsl:if test=""></xsl:if>'