Missing id in stylesheet

The id attribute on the stylesheet root (xsl:stylesheet or xsl:transform) is optional, and on a standalone stylesheet it changes nothing about how the transform runs — it matters only for a stylesheet embedded in another document and referenced by fragment. So this is not a correctness rule; it is a consistency one. Declaring identity is still worth doing: it distinguishes a stylesheet in logs, error messages, and tooling that processes several at once. The only coherent policies are "every stylesheet declares an id" or "none does", and the second cannot be enforced, so xslint asks for the first.

Incorrect:

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <!-- stylesheet logic -->
</xsl:stylesheet>

Correct:

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" id="stylesheet_name">
    <!-- stylesheet logic -->
</xsl:stylesheet>