How To Format Xml
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The XML declaration
XML looks like HTML’s stricter cousin, but the stricter part matters. Unlike HTML, where browsers forgive mismatched tags and missing quotes, XML parsers reject anything malformed—a single unescaped ampersand halts processing. That strictness is the point: XML is used where data integrity across systems is more important than author convenience, which is why it still powers SOAP, SAML, RSS, SVG, OOXML, and a long tail of industry formats. Formatting XML for humans means balancing readability against parser-significant whitespace, attribute order stability for diffs, CDATA preservation, and namespace clarity. This guide covers the XML declaration, DOCTYPE, namespaces, attribute ordering, whitespace handling inside and outside content, CDATA blocks, and the difference between pretty-print and canonical XML.
DOCTYPE and schema references
Pretty-printing rewrites an XML document to be human-readable: consistent indentation, newlines between elements, and wrapped attributes. Canonical XML (C14N) rewrites a document into a byte-identical normalized form used for digital signatures and hash comparisons. C14N rules include: no XML declaration, sorted attribute order, normalized whitespace in attribute values, resolved namespace declarations, and replacement of empty-element tags with start-and-end-tag pairs. C14N output is not especially readable but is reproducible, which is what matters for cryptographic operations on SAML assertions or XML-DSig documents.