<?xml version="1.0" encoding="iso-8859-1"?> <?xml-stylesheet href="../make-menu.xsl" type="text/xsl"?><html> <head> <this-is section="expressions" page="union" subpage=""/> <!-- Generated at 2011-12-09T20:47:22.916Z--><title>Saxonica: XSLT and XQuery Processing: Union</title> <meta name="coverage" content="Worldwide"/> <meta name="copyright" content="Copyright Saxonica Ltd"/> <meta name="title" content="Saxonica: XSLT and XQuery Processing: Union"/> <meta name="robots" content="noindex,nofollow"/> <link rel="stylesheet" href="../saxondocs.css" type="text/css"/> </head> <body class="main"> <h1>Union</h1> <p>The <code>|</code> operator was available in XPath 1.0; the keyword <code>union</code> has been added in XPath 2.0 as a synonym, because it is familiar to SQL users.</p> <p>The expression <code>E1 union E2</code> selects all nodes that are in either <code>E1</code> or <code>E2</code> or both. Both expressions must return sequences of nodes. The results are returned in document order. For example, <code>/book/(chapter | appendix)/sections</code> returns all <code>section</code> elements within a <code>chapter</code> or <code>appendix</code> of the selected <code>book</code> element.</p> <table width="100%"> <tr> <td> <p align="right"><a class="nav" href="arithmetic.xml">Next</a></p> </td> </tr> </table> </body> </html>