| xml_url | R Documentation | 
This is useful for interpreting relative urls with url_relative().
xml_url(x)
x | 
 A node or document.  | 
A character vector of length 1. Returns NA if the name is
not set.
catalog <- read_xml(xml2_example("cd_catalog.xml"))
xml_url(catalog)
x <- read_xml("<foo/>")
xml_url(x)
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