Remove default namespaces from a document (fast xml_ns_strip)

Same result as xml2::xml_ns_strip(), which removes xmlns from every element that has a default namespace in scope. Every element inherits the root's namespace, so it touches every element, and each removal also walks the element's subtree: quadratic in document size (642 s for a 31.5 MB 990-PF return with 505,796 elements). Removing the declaration from the topmost elements that carry it clears the whole subtree in one pass; the loop repeats in case a nested element redeclares a different default.

Usage

xml_ns_strip_fast(x)

Arguments

x

An xml2 document.

Value

x, invisibly (modified in place, like xml2::xml_ns_strip()).