Which features must all XSLT files contain to be considered valid?

A valid XSLT file must include the following key components:

Root Element: < xsl:stylesheet > or < xsl:transform >

Namespace Declaration: Usually xmlns:xsl= " http://www.w3.org/1999/XSL/Transform "

At Least One < xsl:template > to define transformation behavior

From W3C and Workday documentation:

“A valid XSLT file must contain a stylesheet root element, a namespace, and at least one template to be considered executable.”

Why others are incorrect:

A. Prefix and header are not structural requirements.

B. " Transformation " is vague; it ' s the template that implements it.

C. Headers and footers are not required or defined elements in XSLT.