Instead of this:
```ruby
Sitemap('public/sitemap.xml') do
self.stylesheet = 'public/sitemap.xls'
self.ping = ['http://www.google.com', 'http://www.google.com']
end
```
You could write this:
```ruby
Sitemap('public/sitemap.xml') do
stylesheet 'public/sitemap.xls'
ping ['http://www.google.com', 'http://www.google.com']
end
```
Using [dual-purpose accessors](http://sandal.github.com/rbp-book/pdfs/ch03.pdf):
```ruby
class Sitemap
def stylesheet(path = nil)
return @path unless path
@path = path
end
alias_method :stylesheet=, :stylesheet
...
end
```