Go to standardAxis:
ancestor::
Standard excerpt:
the ancestor axis contains the ancestors of the context node; the ancestors of the context node consist of the parent of context
node and the parent's parent and so on; thus, the ancestor axis will always include the root node, unless the context node
is the root node
Examples (xslt:xml): Overview
87:8
Interactive xlab: [xsl:value-of] [xsl:template] [xpath axes] [xpath]