XSLT 2.0 and XPath 2.0 Programmer's Reference, 4th Edition (626 page)

xsl:supports-serialization
This property returns the string
yes
or
no
, depending on whether the XSLT 2.0 processor supports serialization or not.
xsl:supports-backwards-compatibility
This property returns the string
yes
or
no
, depending on whether the XSLT 2.0 processor supports running in backward-compatibility mode. A processor that does not support this mode will report an error if
version=“1.0”
is specified.
xsl:supports-namespace-axis
This property was introduced to the specification by means of an erratum, so not all processors will support it. It returns
yes
if the implementation recognizes the namespace axis, or
no
if it does not. An implementation that has not been updated to recognize this property will return a zero-length string.

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