Include lots more forms of Inform7 syntax. Including embedded Inform6

syntax.

samples/Inform 7/Trivial Extension.i7x

@@ -1,6 +1,73 @@
-Version 1 of Trivial Extension by Andrew Plotkin begins here.
+Version 2 of Trivial Extension by Andrew Plotkin begins here.
+
+"This is the rubric of the extension."
+
+"provided for the Linguist package by Andrew Plotkin"
+
+[Note the two special quoted lines above.]
 
 A cow is a kind of animal. A cow can be purple.
 
+Understand "cow" as a cow.
+Understand "purple" as a purple cow.
+
+Check pushing a cow:
+	instead say "Cow-tipping, at your age?[paragraph break]Inconceivable."
+
+[Here are the possible levels of heading:]
+
+Volume One
+
+Text-line is always "A line of text."
+
+Book 2
+
+	Part the third - indented headings still count
+
+Chapter IV - not for release
+
+[Heading labels are case-insensitive.]
+
+section foobar
+
+[A line beginning "Volume" that does not have blank lines before and after it is *not* a header line. So the following is part of section foobar:]
+
+Measure is a kind of value.
+Volume is a measure. Length is a measure.
+Area is a measure.
+
+[And now some Inform 6 inclusions.]
+
+To say em -- running on:
+	(- style underline; -).
+To say /em -- running on:
+	(- style roman; -).
+
+Include (-
+
+! Inform 6 comments start with ! marks and run to the end of the line.
+Global cowcount;
+
+[ inform6func arg;
+	print "Here is some text; ", (address) 'dictword', ".^";
+	cowcount++;  ! increment this variable
+];
+
+Object i6cow
+	with name 'cow' 'animal',
+	with description "It looks like a cow.";
+	has animate scenery;
+
+-) after "Global Variables" in "Output.i6t".
+
 Trivial Extension ends here.
 
+---- DOCUMENTATION ----
+
+Everything after the "---- DOCUMENTATION ----" line is documentation, so it should have the comment style.
+
+However, tab-indented lines are sample Inform code within the documentation:
+
+	Horns are a kind of thing. Every cow has horns.
+
+So we need to allow for that.