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+Filter Tests
+============
+
+
+== Toy filter example from User Guide
+
+[code,python]
+----------------------------------------------
+''' A multi-line
+    comment.'''
+def sub_word(mo):
+    ''' Single line comment.'''
+    word = mo.group('word')   # Inline comment
+    if word in keywords[language]:
+        return quote + word + quote
+    else:
+        return word
+----------------------------------------------
+
+
+== Pychart Chart generations from FAQ
+
+// Generate chart image file.
+sys2::[python "{indir}/barchart.py" --format=png --output="{outdir={indir}}/{imagesdir=}{imagesdir?/}barchart.png" --scale=2]
+
+// Display chart image file.
+image::barchart.png[]
+
+
+== Graphviz Graphs
+
+.Simple graph
+["graphviz", "graphviz1.png", alt="Graphviz->AsciiDoc->HTML"]
+---------------------------------------------------------------------
+digraph G { rankdir=LR; Graphviz->AsciiDoc->HTML}
+---------------------------------------------------------------------
+
+.Not so simple graph
+["graphviz", "graphviz2.png"]
+---------------------------------------------------------------------
+digraph automata_0 {
+  size ="8.5, 11";
+  node [shape = circle];
+  0 [ style = filled, color=lightgrey ];
+  2 [ shape = doublecircle ];
+  0 -> 2 [ label = "a " ];
+  0 -> 1 [ label = "other " ];
+  1 -> 2 [ label = "a " ];
+  1 -> 1 [ label = "other " ];
+  2 -> 2 [ label = "a " ];
+  2 -> 1 [ label = "other " ];
+  "Machine: a" [ shape = plaintext ];
+}
+---------------------------------------------------------------------
+
+
+== Music filter
+
+.A tune generated from ABC notation
+[music,music1.png]
+---------------------------------------------------------------------
+T:The Butterfly
+R:slip jig
+C:Tommy Potts
+H:Fiddle player Tommy Potts made this tune from two older slip jigs,
+H:one of which is called "Skin the Peelers" in Roche's collection.
+D:Bothy Band: 1975.
+M:9/8
+K:Em
+vB2(E G2)(E F3)|B2(E G2)(E F)ED|vB2(E G2)(E F3)|(B2d) d2(uB A)FD:|
+|:(vB2c) (e2f) g3|(uB2d) (g2e) (dBA)|(B2c) (e2f) g2(ua|b2a) (g2e) (dBA):|
+|:~B3 (B2A) G2A|~B3 BA(uB d)BA|~B3 (B2A) G2(A|B2d) (g2e) (dBA):|
+---------------------------------------------------------------------
+
+<<X1,Link to following fragment>>.
+
+[[X1]]
+.A fragment generated from LilyPond source
+["music", "music2.png", "ly", link="music2.ly"]
+---------------------------------------------------------------------
+\version "2.10.0"
+\paper {
+  ragged-right = ##t
+}
+{
+  \time 3/4
+  \clef bass
+  c2 e4 g2. f4 e d c2 r4
+}
+---------------------------------------------------------------------