Returns a list of environment variable names that are suitable for passing to
environment-variable(), as a (possibly empty) sequence of strings.
available-environment-variables() ➔ xs:string*
There are no arguments
Links to W3C specifications
Available in XPath 3.0, XSLT 3.0, XQuery 3.0, and later versions. From Saxon 9.6, available in all editions.
Notes on the Saxon implementation
Implemented since Saxon 9.4, but without enforcing the rule that the result must be deterministic.