+\change_inserted 1 1269457401
+
+\end_layout
+
+\begin_layout Subsubsection
+
+\change_inserted 1 1269457704
+Why Is My Document Class `Unavailable'?
+\end_layout
+
+\begin_layout Standard
+
+\change_inserted 1 1269458954
+New users are sometimes puzzled by the fact that many of the document classes
+ listed under
+\family sans
+Document\SpecialChar \menuseparator
+Settings\SpecialChar \menuseparator
+Document Class
+\begin_inset Index idx
+status collapsed
+
+\begin_layout Plain Layout
+
+\change_inserted 1 1269457484
+Document ! Settings
+\end_layout
+
+\end_inset
+
+
+\family default
+are marked as
+\begin_inset Quotes eld
+\end_inset
+
+Unavailable
+\begin_inset Quotes erd
+\end_inset
+
+.
+ Or they are surprised that, when they try to open the
+\family sans
+hollywood
+\family default
+ template, they receive a message saying that the document class requires
+ external files to produce output, files that are not installed.
+ Surely something is wrong.
+ Right?
+\end_layout
+
+\begin_layout Standard
+
+\change_inserted 1 1269458991
+Nothing is wrong.
+ LyX includes many more document classes than you will ever need to use,
+ and some of them, like
+\family sans
+hollywood
+\family default
+ (which is used for screenplays), are highly specialized.
+ Indeed, we want LyX to support as many different types of documents as
+ possible, and, as of LyX 2.0, it includes almost one hundred different layout
+ files, with the number growing all the time.
+ No sensible LaTeX distribution will install all of the different files
+ that might be needed by some LyX document class by default.
+ There are too many, and they are too various.
+ That is why some of the document classes are unavailable.
+\change_unchanged
+
+\end_layout
+
+\begin_layout Standard
+
+\change_inserted 1 1269459048
+So, if there is a document class you would like to use that is marked as
+ `Unavailable', all you need to do is install the appropriate class or package
+ files.
+ The easiest way to find out which files you need to install is to try selecting
+ that document class.
+ LyX will display a dialog that, among other things, will list the missing
+ files.
+ Most TeX distributions now include a See section 5.1 of the
+\emph on
+Customization
+\emph default
+ manual for information on how to install them.
+\end_layout
+
+\begin_layout Subsubsection
+
+\change_inserted 1 1269458726
+I Need a Document Class That Isn't Even Listed
+\end_layout
+
+\begin_layout Standard
+
+\change_inserted 1 1269459092
+Although, as said, LyX provides support for many different sorts of documents,
+ it does not include support for every document class people might want
+ to use.
+ For example, many universities provide LaTeX class files to be used for
+ dissertations submitted to those universities.
+ For example, the LaTeX document class
+\family sans
+ucthesis
+\family default
+ is used for dissertations at the University of California.
+ The LyX team cannot write `layout files' to support every one of these.
+ There are too many.
+\end_layout
+
+\begin_layout Standard
+
+\change_inserted 1 1269459143
+Fortunately, however, users can write their own layout files, and many users
+ have done so.
+ Sometimes, this is quite easy, but sometimes it can be quite hard.
+ Chapter 5 of the
+\emph on
+Customization
+\emph default
+ manual contains information on how to add support for your favorite document
+ type.
+\change_unchanged
+