What is XML (Extensible Markup Language)
XML – Extensible Markup Language – is a tag-based format for structuring data so both humans and machines can read it. You wrap information in custom opening and closing tags, like 500, and nest them to represent hierarchy. It used to be the default choice for web APIs, config files, and document exchange, and it’s still common in SOAP-based APIs, banking systems, and older telecom tooling. JSON has since taken over as the lighter-weight format for most modern REST APIs, but XML hasn’t gone away.
How does XML work
XML works by wrapping data in nested tags you define yourself – there’s no fixed vocabulary like HTML has. A typical XML document starts with a declaration line, then a root element containing child elements, each opened and closed with matching tags: Ravi Kumar2500. Attributes can sit inside a tag too, like . Because every value needs its own opening and closing tag, XML documents run longer and more verbose than the equivalent JSON – that same order object in JSON is roughly half the characters. XML also supports schemas (XSD) and namespaces, which let large enterprises validate exactly what shape a document should take before accepting it. That rigor is why banks, government systems, and SOAP-based APIs still lean on XML – it’s harder to send malformed data through it, even if it’s slower to write and parse.
How OneXtel helps with XML
OneXtel’s REST API, Aura (docs.onextel.com), doesn’t ask you to work in XML at all. It’s built as a modern JSON-based REST API, so you send and receive plain JSON objects – lighter, easier to read, and faster to parse than XML/SOAP-style payloads. For a developer sending SMS, WhatsApp messages, OTPs, or triggering a Smart IVR call through Aura, that means shorter request bodies and no need to wrestle with schemas or namespaces just to fire off a message. If you’re integrating at higher throughput, OneXtel also offers SMPP connectivity – an older binary telecom protocol, not XML or JSON – for enterprise-scale sending. Either way, XML simply isn’t part of the picture: you’re working with JSON over REST, or SMPP directly, both of which are simpler to build against than XML-heavy SOAP integrations.
Why it matters
If you’re building or maintaining an integration, knowing whether you’re dealing with XML or JSON changes how you write code, debug errors, and estimate effort. XML parsers, XPath queries, and schema validation are a different skill set from JSON.parse() and dot-notation access, and mixing them up mid-project wastes real time. It also matters for legacy migrations: a lot of telecom and banking systems still speak XML/SOAP under the hood, so if you’re connecting new tools to old ones, you may need to convert formats somewhere in the pipeline. Choosing a JSON-first platform where you can avoids that overhead entirely for new integrations, which is part of why JSON has become the default for anything built after the mid-2010s.