How to "checkout" from a repository ?

[Markus Moeller]

I am new to hg and got a clone of a repository with hg clone ssh://anon@site/repository. Now I would like to get the sources out of the repository to compile them. In cvs I would do a cvs -d repository checkout and I thought with hg it would be hg -R repository update but I only get: 
0 files updated, 0 files merged, 0 files removed, 0 files unresolved

How do I get the sources ?

Thanks
Markus
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