XML Processing with Perl, Python and PHP. Also Covers TCL, by Martin C. Brown
By Martin C. Brown
-The in simple terms ebook that makes a speciality of using XML with the most well-liked scripting languages, together with Perl, Python, personal home page, Ruby, Rebol, TCL, and Mac OS X's AppleScript. -Complete assurance of the middle XML processing concerns, together with the fundamentals of parsin
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Additional info for XML Processing with Perl, Python and PHP. Also Covers TCL, Rebol, Ruby and AppleScript
You can also use simpler methods that check the validity of the tags to ensure that they match and are not nested incorrectly. qxd 24 11/2/01 2:50 AM Page 24 Chapter 3 • Data Type Definitions (DTDs) f an XML document describes data, then a Data Type Definition (DTD) describes the layout and acceptable content of an XML document. A DTD is essentially a description of the layout, structure, and in some cases the content of the character data stored within the XML document. I A DTD is more than just a method for declaring the structure of a document, however.
It may sound insignificant—and indeed most programmers forget they are even using it—but it’s a feature that standard C/C++ implementations don’t have access to. qxd 38 11/2/01 2:52 AM Page 38 Chapter 4 • Applying XML with Scripting Languages Even the available toolkits for supporting such a variable type don’t provide the same flexibility as that offered by Perl or Python because you are ultimately still using C to work with and manipulate the variables. Data modeling of XML and the conversion of information between internal structures and XML are topics that we’ll be concentrating on in the remainder of this book.
The whole document structure should also be noted. We start with a single element,