Automatically creating objective-c classes from a * .xsd schema file

I have XSD schema files that are huge in size.

I need to create classes from these files, but to do it manually is not the way there are some tools that automatically create classes, for example. Microsoft tool "XSD.exe" that converts files to C ++ classes. I wanted to use them in Xcode, but it's hard for me to port it.

What is a good tool that can generate objcetive-c classes that can be used in iOS?

Thanks in advance,

Amit