when choosing Tools/New Snippet from the menu, you get the following template:
<!-- See http://www.sublimetext.com/docs/snippets for more information -->
<snippet>
<content><![CDATA[Type your snippet here]]></content>
</snippet>
i suggest to add to it the now supported:
<tabTrigger>abc</tabTrigger>
<scope>source.abc</scope>
<description>Abc</description>