[xsl] Reading and writing into the same file

In XSLT 1.1 it was possible to read a file in to the XSLT then rewrite
to that same file using the xsl:document function. In XSLT 2 the same
is only possible if you use an extension function such as
saxon:discard-document together with xsl:result-document. Is this
correct and why has this happened?

Thanks

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