Reference
XML formats
Each format's root element, namespaces, media type, and the constraints that cause real failures — not just what the spec says, but what breaks in production.
XML sitemap
<urlset>A list of a site's URLs with optional freshness hints, read by every major search engine.
.xml · .xml.gz
Sitemap index
<sitemapindex>A sitemap of sitemaps, used once a site outgrows a single 50,000-URL file.
.xml · .xml.gz
RSS 2.0
<rss>The most widely deployed syndication format. Namespace-free at its core, extension-heavy in practice.
.xml · .rss
Atom 1.0
<feed>The IETF-standardised syndication format: namespaced, strictly typed, and unambiguous about dates.
.xml · .atom
SOAP envelope
<Envelope>The message envelope for SOAP web services, still the backbone of banking, logistics and telecom integrations.
.xml
XML Schema (XSD)
<schema>The dominant XML schema language: namespace-aware, richly typed, and itself written in XML.
.xsd
WSDL
<definitions>The machine-readable contract for a SOAP service: operations, messages, bindings and endpoints.
.wsdl · .xml
XSLT stylesheet
<stylesheet>A transformation program written in XML, used to reshape one XML vocabulary into another.
.xsl · .xslt
SVG
<svg>A vector image format that is genuine XML, and therefore both diffable and a security surface.
.svg · .svgz
OPML
<opml>A nested outline format, used almost universally for exporting and importing feed subscriptions.
.opml · .xml
RDF/XML
<RDF>A graph serialisation in XML. Also the actual format behind documents labelled RSS 1.0.
.rdf · .xml
GPX
<gpx>The interchange format for GPS waypoints, routes and recorded tracks.
.gpx
KML
<kml>An OGC standard for geographic annotation: placemarks, geometry and styling.
.kml · .kmz
XLIFF
<xliff>The localisation interchange format that carries source text, translations and their state.
.xlf · .xliff
UBL Invoice
<Invoice>The OASIS invoice document behind Peppol and most European e-invoicing mandates.
.xml
Looking up a namespace URI instead? Browse the namespace directory. Debugging a parser message? See the XML error reference.
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