Documentation

Author: kddnewton

README.md

@@ -67,12 +67,6 @@ $ stree write --plugins=xml file.xml
 file.xml 1ms
 ```
 
-## Development
-
-After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake test` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
-
-To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
-
 ## Contributing
 
 Bug reports and pull requests are welcome on GitHub at https://github.com/ruby-syntax-tree/syntax_tree-xml.

lib/syntax_tree/xml/visitor.rb

@@ -2,6 +2,10 @@
 
 module SyntaxTree
   module XML
+    # Provides a visitor interface for visiting certain nodes. It's used
+    # internally to implement formatting and pretty-printing. It could also be
+    # used externally to visit a subset of nodes that are relevant to a certain
+    # task.
     class Visitor
       def visit(node)
         node&.accept(self)