April 2002
Intermediate to advanced
218 pages
6h 12m
English
Content preview from Perl and XMLBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 2. An XML Recap
XML is a revolutionary (and evolutionary) markup language. It combines the generalized markup power of SGML with the simplicity of free-form markup and well-formedness rules. Its unambiguous structure and predictable syntax make it a very easy and attractive format to process with computer programs.
You are free, with XML, to design your own markup language that best fits your data. You can select element names that make sense to you, rather than use tags that are overloaded and presentation-heavy. If you like, you can formalize the language by using element and attribute declarations in the DTD.
XML has syntactic shortcuts such as entities, comments, processing
instructions, and CDATA sections. It allows you to group elements and
attributes by namespace to further organize the vocabulary of your
documents. Using the xml:space attribute can
regulate whitespace, sometimes a tricky issue in markup in which
human readability is as important as correct formatting.
Some very useful technologies are available to help you maintain and mutate your documents. Schemas, like DTDs, can measure the validity of XML as compared to a canonical model. Schemas go even further by enforcing patterns in character data and improving content model syntax. XSLT is a rich language for transforming documents into different forms. It could be an easier way to work with XML than having to write a program, but isn’t always.
This chapter gives a quick recap of XML, where it came from, ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.