I noticed that to_xml on an ActiveRecord object that has a boolean attribute, but that boolean attribute is nil, will serialize out an xml entry of type boolean but without a value; it's just empty. This is even the accepted behavior that is tested with NilXmlSerializationTest's test_should_serialize_boolean.
However, the w3c's xml schema spec on datatypes has something like this:
"An instance of a datatype that is defined as boolean can have the following legal literals {true, false, 1, 0}."
So should xml_serialization.rb force all booleans to true/false instead of allowing for the empty version of the field?
If it should compute_value could just have a:
elsif type == :boolean value == true
in there?