j2ee: JSTL tags [20/27]

JSTL comes in 4 libraries:

1. Core library - c
2. XML processing library - x
3. Internationalization (i18n) library - fmt
4. Database Access (SQL) library - sql

Core is for management of variables, iteration, output, conditional logic

XML processing is for parsing, selection of XML, XSTL transforms, logic based on XML data

The i18n library supports formatting of things like currency, dates, and numbers, as well as localized output of content based on Locale

The SQL library is not meant to promote good design of database based apps, but provide for easy access to databases and presentation of the data, without a large amount of abstraction.