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Layout templates in Dapper are based on a superset of the [Template
Toolkit](http://template-toolkit.org/) v3 (TT3) mini language as implemented by
[Template::Alloy](http://search.cpan.org/~rhandom/Template-Alloy/). 
Although both Dapper and Template::Alloy are both written in Perl, you do 
not need to know Perl in order to use them.

Layout templates include a series of directives. Directives can be
used to print the contents of a variable, or perform more sophisticated
computation such as if/then/else, foreach, or case statements. Directives
are surrounded by matched pairs of hard brackets and percent signs. Here is
an example of printing a variable called `site.name`:

```
[% site.name %]
```

When printing variables, you may also use filters to transform the variable
or print information about it. For instance, you can convert a variable 
name to all uppercase letters using the `upper` filter. Example: