<?xml version="1.0" encoding="iso-8859-1"?> <?xml-stylesheet href="../../make-menu.xsl" type="text/xsl"?><html> <head> <this-is section="changes" page="intro92" subpage="functions92"/> <!-- Generated at 2011-12-09T20:47:22.916Z--><title>Saxonica: XSLT and XQuery Processing: Functions and Operators</title> <meta name="coverage" content="Worldwide"/> <meta name="copyright" content="Copyright Saxonica Ltd"/> <meta name="title" content="Saxonica: XSLT and XQuery Processing: Functions and Operators"/> <meta name="robots" content="noindex,nofollow"/> <link rel="stylesheet" href="../../saxondocs.css" type="text/css"/> </head> <body class="main"> <h1>Functions and Operators</h1> <p>In regular expressions, the rules on back-references as defined in errata E4 and E24 have now been implemented. Backreferences of more than two digits are now recognised; a back-reference is recognized as the longest sequence of digits after "\" that is either one digit or is longer than the number of preceding left parentheses; a backreference must not start with the digit zero; a backreference N is an error if it appears before the closing bracket corresponding to the Nth opening bracket.</p> <p>The rules for regular expressions in the draft XML Schema 1.1 specification clarify the ways in which hyphens may be used within a character class expression (that is, within square brackets). To implement these rules, Saxon now disallows an unescaped hyphen at the start or end of a character range (for example <code>[--a]</code>).</p> <p>The option <code>alphanumeric=codepoint</code> is now available in collation URIs to request alphanumeric collation (integers embedded in the string are sorted as integers) with codepoint collation for the "alpha" parts of the string.</p> <p>The <code>collection()</code> function now allows directories of text files to be read, provided the text uses characters that are legal in XML. This is achieved using the additional query parameter <code>unparsed=yes</code> in the collection URI. The resulting files are returned in the form of document nodes, each having a single text node as a child. The platform default encoding is assumed.</p> <p><i>Since the <code>unparsed-text()</code> function is not available in XQuery, this also gives a way of reading unparsed text files from XQuery. Simply use <code>collection('file:/c:/my/dir/?select=filename.txt')</code>.</i></p> <table width="100%"> <tr> <td> <p align="right"><a class="nav" href="parsing92.xml">Next</a></p> </td> </tr> </table> </body> </html>