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diff --git a/haddock-library/src/Documentation/Haddock/Markup.hs b/haddock-library/src/Documentation/Haddock/Markup.hs
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+++ b/haddock-library/src/Documentation/Haddock/Markup.hs
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+module Documentation.Haddock.Markup where
+
+import Documentation.Haddock.Types
+
+markup :: DocMarkupH mod id a -> DocH mod id -> a
+markup m DocEmpty                    = markupEmpty m
+markup m (DocAppend d1 d2)           = markupAppend m (markup m d1) (markup m d2)
+markup m (DocString s)               = markupString m s
+markup m (DocParagraph d)            = markupParagraph m (markup m d)
+markup m (DocIdentifier x)           = markupIdentifier m x
+markup m (DocIdentifierUnchecked x)  = markupIdentifierUnchecked m x
+markup m (DocModule mod0)            = markupModule m mod0
+markup m (DocWarning d)              = markupWarning m (markup m d)
+markup m (DocEmphasis d)             = markupEmphasis m (markup m d)
+markup m (DocBold d)                 = markupBold m (markup m d)
+markup m (DocMonospaced d)           = markupMonospaced m (markup m d)
+markup m (DocUnorderedList ds)       = markupUnorderedList m (map (markup m) ds)
+markup m (DocOrderedList ds)         = markupOrderedList m (map (markup m) ds)
+markup m (DocDefList ds)             = markupDefList m (map (markupPair m) ds)
+markup m (DocCodeBlock d)            = markupCodeBlock m (markup m d)
+markup m (DocHyperlink l)            = markupHyperlink m l
+markup m (DocAName ref)              = markupAName m ref
+markup m (DocPic img)                = markupPic m img
+markup m (DocMathInline mathjax)     = markupMathInline m mathjax
+markup m (DocMathDisplay mathjax)    = markupMathDisplay m mathjax
+markup m (DocProperty p)             = markupProperty m p
+markup m (DocExamples e)             = markupExample m e
+markup m (DocHeader (Header l t))    = markupHeader m (Header l (markup m t))
+
+markupPair :: DocMarkupH mod id a -> (DocH mod id, DocH mod id) -> (a, a)
+markupPair m (a,b) = (markup m a, markup m b)
+
+-- | The identity markup
+idMarkup :: DocMarkupH mod id (DocH mod id)
+idMarkup = Markup {
+  markupEmpty                = DocEmpty,
+  markupString               = DocString,
+  markupParagraph            = DocParagraph,
+  markupAppend               = DocAppend,
+  markupIdentifier           = DocIdentifier,
+  markupIdentifierUnchecked  = DocIdentifierUnchecked,
+  markupModule               = DocModule,
+  markupWarning              = DocWarning,
+  markupEmphasis             = DocEmphasis,
+  markupBold                 = DocBold,
+  markupMonospaced           = DocMonospaced,
+  markupUnorderedList        = DocUnorderedList,
+  markupOrderedList          = DocOrderedList,
+  markupDefList              = DocDefList,
+  markupCodeBlock            = DocCodeBlock,
+  markupHyperlink            = DocHyperlink,
+  markupAName                = DocAName,
+  markupPic                  = DocPic,
+  markupMathInline           = DocMathInline,
+  markupMathDisplay          = DocMathDisplay,
+  markupProperty             = DocProperty,
+  markupExample              = DocExamples,
+  markupHeader               = DocHeader
+  }