The system-property function returns properties of the XSLT processor (the system). Three system properties, all in the XSLT namespace, are mandatory for XSLT processors. These are xsl:version, xsl:vendor, and xsl:vendor-url.
The input string is evaluated as a QName and so must have the xsl:prefix, since this is the prefix associated with the XSLT namespace in the underlying XSLT stylesheet.
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