1. A system for user interface optimization, the system comprising: a rules base configured to store a plurality of rules that define an application having a user interface; a rules engine configured to execute at least one rule from the rules base; and a digital data processor in communication with the rules base and the rules engine, wherein the system is configured for: identifying one or more rules for execution by the rules engine; generating any of (a) a markup language page providing a user interface and (b) a markup language stream providing the user interface as a result of execution of the one or more rules; determining whether one or more aspects of the generated user interface is in conformity with one or more requirements based on comparing the one or more aspects of the user interface with the one or more requirements, the one or more aspects of the user interface pertaining to any of accessibility of the user interface by disabled users, amenability of the user interface to localization/globalization, and a need for localizing/globalizing the user interface, wherein the one or more requirements are defined relative to any of (a) one or more other rules and/or a user interface generated based thereon, (b) transactional data relating to the user interface, (c) a context in which the user interface is any of transmitted, displayed, and viewed by a user, and (d) a collection defining any of grammar, spelling, usage, punctuation, and style of the user interface; responding to a negative such determination by executing any of: i. generating a notification that identifies modifications to the one or more rules so as to generate at least one of the markup language page and the markup language stream providing a conforming user interface, the conforming user interface including a feature having a modified display characteristic vis-à-vis a non-conforming user interface, wherein the display characteristic is modified based on one or more of the requirements relating to any of (a) transactional data associated with the field having the modified display characteristic and (b) the context in which the user interface is any of transmitted, displayed, and viewed by the user, and wherein execution of the one or more rules would otherwise result in the non-conforming user interface, ii. modifying the one or more rules so as to generate the at least one of the markup language page and the markup language stream providing the conforming user interface, and iii. modifying the at least one of the markup language page and the markup language stream providing the conforming user interface, and any of storing to and generating as output from the system at least one of the generated notification, the modified one or more rules, the modified markup language page, and the modified markup language stream providing the conforming user interface.
14. The system of claim 1 , wherein the conforming user interface includes a field that is repositioned compared to the non-conforming user interface otherwise resulting from execution of the one or more rules, and wherein a location of the repositioned field is based on a location of another field in the user interface.