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+Mercurial supports a functional language for selecting a set of
+revisions.
+
+The language supports a number of predicates which are joined by infix
+operators. Parenthesis can be used for grouping.
+
+Identifiers such as branch names must be quoted with single or double
+quotes if they contain characters outside of
+``[._a-zA-Z0-9\x80-\xff]`` or if they match one of the predefined
+predicates.
+
+Special characters can be used in quoted identifiers by escaping them,
+e.g., ``\n`` is interpreted as a newline. To prevent them from being
+interpreted, strings can be prefixed with ``r``, e.g. ``r'...'``.
+
+There is a single prefix operator:
+
+``not x``
+  Changesets not in x. Short form is ``! x``.
+
+These are the supported infix operators:
+
+``x::y``
+  A DAG range, meaning all changesets that are descendants of x and
+  ancestors of y, including x and y themselves. If the first endpoint
+  is left out, this is equivalent to ``ancestors(y)``, if the second
+  is left out it is equivalent to ``descendants(x)``.
+
+  An alternative syntax is ``x..y``.
+
+``x:y``
+  All changesets with revision numbers between x and y, both
+  inclusive. Either endpoint can be left out, they default to 0 and
+  tip.
+
+``x and y``
+  The intersection of changesets in x and y. Short form is ``x & y``.
+
+``x or y``
+  The union of changesets in x and y. There are two alternative short
+  forms: ``x | y`` and ``x + y``.
+
+``x - y``
+  Changesets in x but not in y.
+
+The following predicates are supported:
+
+.. predicatesmarker
+
+Command line equivalents for :hg:`log`::
+
+  -f    ->  ::.
+  -d x  ->  date(x)
+  -k x  ->  keyword(x)
+  -m    ->  merge()
+  -u x  ->  user(x)
+  -b x  ->  branch(x)
+  -P x  ->  !::x
+  -l x  ->  limit(expr, x)
+
+Some sample queries:
+
+- Changesets on the default branch::
+
+    hg log -r "branch(default)"
+
+- Changesets on the default branch since tag 1.5 (excluding merges)::
+
+    hg log -r "branch(default) and 1.5:: and not merge()"
+
+- Open branch heads::
+
+    hg log -r "head() and not closed()"
+
+- Changesets between tags 1.3 and 1.5 mentioning "bug" that affect
+  ``hgext/*``::
+
+    hg log -r "1.3::1.5 and keyword(bug) and file('hgext/*')"
+
+- Changesets in committed May 2008, sorted by user::
+
+    hg log -r "sort(date('May 2008'), user)"
+
+- Changesets mentioning "bug" or "issue" that are not in a tagged
+  release::
+
+    hg log -r "(keyword(bug) or keyword(issue)) and not ancestors(tagged())"