-namespace with an "std::" prefix, rather than rely on "using namespace std;".
-</p>
-
-<p> In header files, adding a 'using namespace XXX' directive pollutes the
-namespace of any source file that includes the header. This is clearly a bad
-thing.</p>
-
-<p>In implementation files (e.g. .cpp files) the rule is more of a stylistic
-rule, but is still important. Basically, using explicit namespace prefixes
-makes
-the code <b>more clear</b> - because it is immediately obvious what facilities
-are being used and where they are coming from - and <b>more portable</b> -
-because namespace clashes cannot occur between LLVM code and other namespaces.
-The portability rule is important because different standard library
-implementations expose different symbols (potentially ones they shouldn't) and
-future revisions to the C++ standard will add more symbols to the std
-namespace. As such, we never 'using namespace std;' in LLVM.</p>
-
-<p>The exception to the general rule (i.e. it's not an exception for the std
-namespace) is for implementation files. For example, all of the code in the
-LLVM project implements code that lives in the 'llvm' namespace. As such, it
-is ok, and actually more clear, for the .cpp files to have a 'using namespace
-llvm' directive at their top, after the #includes. The general form of this
-rule is that any .cpp file that implements code in any namespace may use that
-namespace (and its parents), but should not use any others.</p>
+namespace with an "<tt>std::</tt>" prefix, rather than rely on
+"<tt>using namespace std;</tt>".</p>
+
+<p> In header files, adding a '<tt>using namespace XXX</tt>' directive pollutes
+the namespace of any source file that includes the header. This is clearly a
+bad thing.</p>
+
+<p>In implementation files (e.g. .cpp files), the rule is more of a stylistic
+rule, but is still important. Basically, using explicit namespace prefixes
+makes the code <b>clearer</b>, because it is immediately obvious what facilities
+are being used and where they are coming from, and <b>more portable</b>, because
+namespace clashes cannot occur between LLVM code and other namespaces. The
+portability rule is important because different standard library implementations
+expose different symbols (potentially ones they shouldn't), and future revisions
+to the C++ standard will add more symbols to the <tt>std</tt> namespace. As
+such, we never use '<tt>using namespace std;</tt>' in LLVM.</p>
+
+<p>The exception to the general rule (i.e. it's not an exception for
+the <tt>std</tt> namespace) is for implementation files. For example, all of
+the code in the LLVM project implements code that lives in the 'llvm' namespace.
+As such, it is ok, and actually clearer, for the .cpp files to have a '<tt>using
+namespace llvm</tt>' directive at their top, after the <tt>#include</tt>s. The
+general form of this rule is that any .cpp file that implements code in any
+namespace may use that namespace (and its parents'), but should not use any
+others.</p>