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Useful hooks

Some packages and document styles had to redefine the command \document or \enddocument to achieve their goal. This is no longer necessary. You can now use the `hooks' \AtBeginDocument and \AtEndDocument (see Section 4.6). Again, using these hooks makes it less likely that your code breaks with future versions of LATEX. It also makes it more likely that your package can work together with someone else's.

However, note that code in the \AtBeginDocument hook is part of the preamble. Thus there are restrictions on what can be put there; in particular, no typesettting can be done.

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