xsltproc includes {http://exslt.org/strings}replace these days. Bind some prefix to this namespace, for example. string, and then call the string: replace ().
You can get a list of extensions compiled into xsltproc using the shell command:
xsltproc --dumpextensions
If your libxsltproc is from the same assembly, I think it should have the same extensions.
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