I am doing research in E-learning 2.0. I want to create metadata using folksonomies. The Website del.cio.us contains folksonomical data. I read in one paper, the folksonomical data in del.cio.us available in XML or JSON format. In it, I am having a doubt. How that site, convert the folksonomical data to XML or JSON? Through that, I want to know how to create the metadata using folksonomical data for e-learning systems.