XML-XPATH. Merging node lists

the xpath expression "//book" selects all "book" nodes, and the xpath "//pen" selects all pen nodes.
How to make a single xpath expression that selects all "book" nodes and "pen" nodes at the same time?

Something like "//book and //pen" or "merge(//book, //pen)
(these do not work)

Who is Participating?
<xsl:value-of select="//book | //pen"/>
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