The term "blades" refers to a smaller circuit inserted into a larger machine footprint, with many other blades, where each blade is performing, as it's own distinct computer. This notion is commonly referred to as "blade computing."
A petabyte is a term that indicates a unit of computer memory or data storage capacity equal to 1,024 terabytes (or 250 bytes): one quadrillion bytes.
Please refer to the book Business On Demand: Technology and Strategy Perspectives (Fellenstein, 2004) for further details and precision on important technologies, Grid Computing, and key strategy perspectives.
XML (Extensible Markup Language) is a meta-language written in SGML (Standardized Markup Language) that allows one to design a markup language used to allow for the easy interchange of documents and data across the World Wide Web.
Please refer to Fellenstein (2004) for further details and precision on important technologies, Grid Computing, and key strategy perspectives.