Struts Logic Taglib
The "struts-logic" tag library contains tags that are useful in managing conditional generation of output text, looping over object collections for repetitive generation of output text, and application flow management.
Struts Nested Taglib
Nested tags & supporting classes extend the base struts tags to allow them to relate to each other in a nested nature. The fundamental logic of the original tags don't change, except in that all references to beans and bean properties will be managed in a nested context.