ancestor-or-self - XPath
the ancestor-or-self axis indicates the context node and all of its ancestors, including the root node.

Axes - XPath
ancestor-or-self indicates the context node and all of its ancestors, including the root node.

Index - XPath
4 ancestor-or-self axe, xpath the ancestor-or-self axis indicates the context node and all of its ancestors, including the root node.

<xsl:number> - XSLT: Extensible Stylesheet Language Transformations
the processor goes to the first node in the ancestor-or-self axis that matches the count attribute and then counts that node plus all its preceding siblings (stopping when it reaches a match to the from attribute, if there is one) that also match the count attribute.if no match is found, the sequence will be an empty list.

The Netscape XSLT/XPath Reference - XSLT: Extensible Stylesheet Language Transformations
) xsl:param (supported) xsl:preserve-space (supported) xsl:processing-instruction xsl:sort (supported) xsl:strip-space (supported) xsl:stylesheet (partially supported) xsl:template (supported) xsl:text (partially supported) xsl:transform (supported) xsl:value-of (partially supported) xsl:variable (supported) xsl:when (supported) xsl:with-param (supported) axes ancestor ancestor-or-self attribute child descendant descendant-or-self following following-sibling namespace (not supported) parent preceding preceding-sibling self functions boolean() (supported) ceiling() (supported) concat() (supported) contains() (supported) count() (supported) current() (supported) document() (supported) element-available() (supported) false() (supported) floor() ...

Transforming XML with XSLT - XSLT: Extensible Stylesheet Language Transformations
supported) xsl:param (supported) xsl:preserve-space (supported) xsl:processing-instruction xsl:sort (supported) xsl:strip-space (supported) xsl:stylesheet (partially supported) xsl:template (supported) xsl:text (partially supported) xsl:transform (supported) xsl:value-of (partially supported) xsl:variable (supported) xsl:when (supported) xsl:with-param (supported) axes ancestor ancestor-or-self attribute child descendant descendant-or-self following following-sibling namespace (not supported) parent preceding preceding-sibling self functions boolean() (supported) ceiling() (supported) concat() (supported) contains() (supported) count() (supported) current() (supported) document() (supported) element-available() (supported) false() (supported) floor() (supported)...