Step set-base-uri {http://www.daisy.org/ns/pipeline/xproc}

Changes the base URI of the document.

px:set-base-uri has an effect on all elements that do not have an ancestor with an absolute xml:base, unless that element is the root element. Whether an element has a different base URI than its parent does not matter as long as this is not made explicit with an xml:base attribute. Elements with a relative xml:base are also affected by the px:set-base-uri in that their absolute base URI changes accordingly, but the xml:base attribute is not changed. Elements with an absolute xml:base, and their descendants, are not affected by the px:set-base-uri.

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