Effective XML: 50 Specific Ways to Improve Your XML by Elliotte Rusty Harold

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As usual, a real-world document would be considerably more complex and contain a lot more data, but this is enough to present the basic ideas. Leaving aside comments, a modular DTD normally starts in a driver module. This is a DTD fragment that declares a couple of crucial entity references, such as those defining the namespace URI and prefix, then loads the other modules.

Com/ Following the copyright and authorship information, the next thing is normally a brief description of the XML application the DTD describes. For example, the bank statement application might include something like this: This is the DTD for MBSML, the MegaBank Statement Markup Language. It is used for account statements sent to both business and consumer customers at the end of each month. Each document represents a complete statement for a single account. It handles savings, checking, CD, and money market accounts.

0. 0 and later define for mathematics than the pure SGML mathematical entity sets. [ Team LiB ] [ Team LiB ] Item 5. Comment DTDs Liberally DTDs can be as obfuscated as C++ code written by a first-year undergrad. You should use lots of comments to explain exactly what's going on. Well-written DTDs such as the modular XHTML DTD often contain more than twice as many lines of comments as actual code. The list that follows shows some of the information you should include in a DTD. • Who wrote it and how to contact them • The copyright and use conditions that apply to the DTD • The version of the DTD • The namespace URI • The PUBLIC and SYSTEM identifiers for the DTD • The root elements • A brief description of the application the DTD models • The purpose and content of each parameter entity defined • The purpose and content of each general entity defined • The meaning of each element declared by an ELEMENT declaration • The meaning of each attribute declared in an ATTLIST declaration • The meaning of each notation declared in a NOTATION declaration • Additional constraints on elements and attributes that cannot be specified in a DTD, for example, that a length attribute must contain a positive integer For example, let's consider a DTD designed for bank statements like the ones your bank sends you at the end of every month.