Binary package “xmlformat-perl” in ubuntu oracular
XML Document Formatter
xmlformat is a configurable formatter (or "pretty-printer") for XML documents.
It provides control over indentation, line-breaking, and text wrapping. These
properties can be defined on a per-element basis.
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xmlformat provides improved diagnostic information when a document is not
well-formed. (Prints line and token number, and stack trace).
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This is the perl implementation