U '1eNC@sdZdZdZddlmZddlmZmZmZm Z ddl m Z ddl m ZmZmZmZmZmZmZmZmZmZ m!Z"m#Z$m%Z&e eddZ'e eddZ(e eddZ)Gd d d Z*Gd d d e*Z+e,eeeee d fddZ-Gddde*Z.Gddde*Z/e0Z1GdddZ2ddZ3ddZ4dS)z3.3.0aClasses for ParagraphStyle and similar things. A style is a collection of attributes, but with some extra features to allow 'inheritance' from a parent, and to ensure nobody makes changes after construction. 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The idea is to: 1. slightly simplify construction of stylesheets; 2. enforce rules to validate styles when added (e.g. we may choose to disallow having both 'heading1' and 'Heading1' - actual rules are open to discussion); 3. allow aliases and alternate style lookup mechanisms 4. 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