require 'xsd/mapping'

when you use xsd2ruby with --mapping_registry as in the samples for marshal... you get an error for require 'xsd/mapping' .. probably due to the fact that this is no longer in standard library?

Can you please help?

Have you tried running it when Soap4R is installed under Bundler and a Gemfile -- i.e. "bundle exec" and your ruby invocation command?

"xsd/mapping" refers to "lib/xsd/mapping.rb" in Soap4R. If you're not using Bundler, you'll have to use other mechanisms to get the Soap4R code into scope enough to work with a require command.