Generate XSD from XML

Sometimes we need to generate XML-Schema (e.g. XSD) from a given XML document. There are many tools but the one I use is called trang. Here are simple steps to generate xsd of a xml file (input.xml):

1. Download and Unzip trang-20030619.zip
2. Go to trang-20030619 folder and use following command:
java -jar trang.jar -I xml -O xsd input.xml output.xsd