XML 1.0: Structured Data for the Rest of Us

It’s February 1998, and the World Wide Web Consortium (W3C) has just released the XML 1.0 recommendation. If you’ve been following the discussions, you know this is a big deal. For years, we’ve been struggling with two extremes: HTML, which is great for display but terrible for data structure, and SGML, which is powerful but so complex that only a few specialists can use it.

XML (eXtensible Markup Language) is the "Goldilocks" solution.

Data, Not Display

Unlike HTML, where tags like <h1> and <b> tell the browser how to look, XML tags tell the computer what the data is.

<?xml version="1.0" encoding="UTF-8"?>
<Order>
    <ID>12345</ID>
    <Customer>John Doe</Customer>
    <Items>
        <Item id="A101">
            <Name>Widget</Name>
            <Price currency="USD">19.99</Price>
        </Item>
    </Items>
</Order>

This is incredibly powerful. Because the tags are self-describing, any system can (in theory) parse this data and understand its structure. We finally have a standard way to exchange data between different platforms and applications without resorting to custom binary formats or fragile comma-separated files.

The Ecosystem

But XML isn't just about the tags. It’s the beginning of a whole ecosystem. We have DTDs (Document Type Definitions) to validate structure, and there's talk of something called XSL (Extensible Stylesheet Language) to transform XML into other formats like HTML.

The Over-Engineering Risk

I do have some concerns. I’m already seeing people proposing incredibly complex schemas for everything under the sun. There’s a risk that XML will become as bloated as the SGML it was meant to simplify. And the fact that it's text-based means it’s not the most efficient format for large amounts of data.

Looking Ahead

Despite the potential for bloat, XML is a game-changer. It’s going to be the foundation for Web Services, configuration files, and cross-enterprise data exchange. As developers, we’re going to be spending a lot of time with parsers in the coming years. Get ready for the era of "Everything is a Tree."