How To Read And Write Xml
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XML basics — the syntax rules
XML is the 30-year-old granddaddy of structured data — verbose, strict, and still everywhere you don’t expect: RSS feeds, SOAP APIs, SVG images, Office file formats (.docx, .xlsx), Android layouts, Maven builds, sitemaps, and enterprise data exchange. JSON won the web, but XML won the enterprise. This guide covers XML syntax (elements, attributes, namespaces), when XML is the right choice versus JSON, how to parse and generate it safely (entity escaping, injection risks), schemas (DTD, XSD, Relax NG), XPath and XSLT, and the gotchas that trip up even experienced developers.
XML vs JSON — when each wins
Every XML document needs a single root element. Tags must nest properly. Attributes go in quotes. Case matters.
Namespaces — the feature most people hate
Namespaces are URIs but they’re just identifiers — the URL doesn’t have to resolve. Most developers copy namespaces from docs and never think about them again.
Escaping — the #1 bug source
Five characters need escaping in XML:
XML schema — validating structure
Great for embedding code snippets, HTML content, or already-formatted text. Doesn’t need to be nested — just wraps the block.
Parsing XML safely
DOM loads the whole document into memory. Easy, slow, bad for large files.
XPath and XSLT
SAX is event-driven — parser calls your callbacks as it streams. Fast, memory-efficient, harder to write.
Formatting and indentation
StAX (pull parser) is the modern middle ground. You pull events when you want them. Good for large files with selective processing.
Common mistakes
XPath ships with most languages. Learn the 20% that handles 80% of queries: paths, attribute filters, text() nodes, position() filters.
Run the numbers
XML whitespace rules are subtle. Indentation is usually ignored inside element content but preserved inside attributes and CDATA. Pretty-printers typically use 2- or 4-space indentation.