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XSweet currently ships with Saxon 9.8.0.1. However, upgrading to use 9.9.1.1 causes some warnings and errors.

First, the newest version of Saxon shows the following 3 warnings, twice from handle-notes.xsl and once in the make-header-escalator-xslt.xsl sheet:

Warning in xsl:variable/@select on line 38 column 69 of handle-notes.xsl:
  SXWN9000: in {div[}:
    The keyword 'div' in this context means 'child::div'. If this was intended, use
  'child::div' or './div' to avoid this warning.
Warning in xsl:variable/@select on line 51 column 70 of handle-notes.xsl:
  SXWN9000: in {div[}:
    The keyword 'div' in this context means 'child::div'. If this was intended, use
  'child::div' or './div' to avoid this warning.
Warning in xsl:apply-templates/@select in make-header-escalator-xslt.xsl:
  SXWN9000: in {div[}:
    The keyword 'div' in this context means 'child::div'. If this was intended, use
  'child::div' or './div' to avoid this warning.

This is just a noisy warning and doesn't cause any problems, but might be worth addressing.

The ucp-text-macros.xsl sheet, though, causes a breaking error:

Error evaluating (($original, ...)) in xsl:sequence/@select on line 283 column 79 of ucp-text-macros.xsl:
  FORX0002: Syntax error at char 8 in regular expression: Expected '{' after \112. Failed
  while atomizing the result of template match="xsw:sequence". Failed while atomizing the
  result of template match="xsw:sequence"
  In template rule with match="element(Q{http://coko.foundation/xsweet}sequence)" on line 258 of ucp-text-macros.xsl
     invoked by xsl:apply-templates at file:/Users/atheg/Desktop/x_demo/koosum/XSweet_runner_scripts/XSweet-master-2edfadb9b06cf13d4f70701da62af809c9d55136/scripts/../applications/htmlevator/applications/ucp-cleanup/ucp-text-macros.xsl#186
  In template rule with match="element(Q{http://www.w3.org/1999/xhtml}p)" on line 173 of ucp-text-macros.xsl
     invoked by built-in template rule (shallow-copy)
  In template rule with match="text()[fn:not(...)]" on line 254 of ucp-text-macros.xsl
Syntax error at char 8 in regular expression: Expected '{' after \112. Failed while atomizing the result of template match="xsw:sequence". Failed while atomizing the result of template match="xsw:sequence"
Error on line 1 column 1 of test-11UCPTEXTED.xhtml:
  SXXP0003: Error reported by XML parser: Premature end of file.
org.xml.sax.SAXParseException; systemId: file:/Users/atheg/Desktop/x_demo/koosum/XSweet_runner_scripts/XSweet-master-2edfadb9b06cf13d4f70701da62af809c9d55136/scripts/../outputs/test/test-11UCPTEXTED.xhtml; lineNumber: 1; columnNumber: 1; Premature end of file.

I'll examine further for a fix.