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Transforms needed by most or all documents:
- `Decorations`: Generate a document's header & footer.
- `ExposeInternals`: Expose internal attributes.
- `Messages`: Placement of system messages generated after parsing.
- `FilterMessages`: Remove system messages below verbosity threshold.
- `TestMessages`: Like `Messages`, used on test runs.
- `StripComments`: Remove comment elements from the document tree.
- `StripClassesAndElements`: Remove elements with classes
in `self.document.settings.strip_elements_with_classes`
and class values in `self.document.settings.strip_classes`.
- `SmartQuotes`: Replace ASCII quotation marks with typographic form.
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Populate a document's decoration element (header, footer).
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Expose internal attributes if ``expose_internals`` setting is set.
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Place any system messages generated after parsing into a dedicated section
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Remove system messages below verbosity threshold.
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Append all post-parse system messages to the end of the document.
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Remove comment elements from the document tree (only if the
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Remove from the document tree all elements with classes in
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