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diff --git a/docs/ssi.py b/docs/ssi.py
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+'''
+Shared code for ssi_server.py and ssi_expander.py.
+'''
+
+import re
+
+def InlineIncludes(path):
+  """Read a file, expanding <!-- #include --> statements."""
+  content = file(path).read()
+  content = re.sub(r'<!-- *#include *virtual=[\'"]([^\'"]+)[\'"] *-->',
+      lambda x: file(x.group(1)).read(),
+      content)
+  return content
+