The technology companies focus on XML as a programming language. The methods for code reuse, found in Object-Oriented programming literature, are similar to the methods used to achieve modular writing. Code reuse is the assertion that if you build generic objects they can be used and reused. It is the idea that you can isolate functionality into a module (function) and then use that module rather than rewriting the code. The ideas are the same. Unfortunately, the programming literature faces the same implementation gap, from the other side.
The XML programming books, which don’t describe its implementation as a language, describe the multitude of ways you can use XML. They tell you how to write the XML and how to process it: They do not tell you how to make XML work in a single sourcing environment. In addition, these books are not aimed at either of the groups that the single sourcing documentation targets. XML authors assume their readers have a programming background and already understand programming concepts.
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The only problem with this side of the triangle is that nearly all of the literature is technical in nature. Most books on XML contain information about programming XML applications—from programming XML compilers to web-services. At this, they are very good. But this group too is missing the rest of the triangle. The components that bridge the nuts and bolts of technology and real-world practice. And, once again, we find that they are not alone.
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