HTML_Template_Sigma implements Integrated Templates API designed by Ulf Wendel. Features: * Nested blocks. Nesting is controlled by the engine. * Ability to include files from within template: * Automatic removal of empty blocks and unknown variables (methods to manually tweak/override this are also available) * Methods for runtime addition and replacement of blocks in templates * Ability to insert simple function calls into templates: func_uppercase('Hello world!') and to define callback functions for these * 'Compiled' templates: the engine has to parse a template file using regular expressions to find all the blocks and variable placeholders. This is a very "expensive" operation and is an overkill to do on every page request: templates seldom change on production websites. Thus this feature: an internal representation of the template structure is saved into a file and this file gets loaded instead of the source one on subsequent requests (unless the source changes) * PHPUnit-based tests to define correct behaviour * Usage examples for most of the features are available, look in the docs/ directory WWW: https://pear.php.net/package-info.php?package=HTML_Template_Sigma