Q = m*s*dT, where Q = heat, m = mass, s = specific heat, and dT is the change in temperature (T2 - T1). You can use this formula to calculate the specific heat. In the case of gases, just replace the mass by moles of the gas.
eXtensible markup language. XML is a file extension for an Extensible Markup Language (XML) file format used to create common information formats and share both the format and the data on the World Wide Web, intranets, and elsewhere using standard ASCII text. XML is similar to HTML.
For readers unacquainted with either term, HTML is the set of codes (that's the markup language) that a writer puts into a document to make it displayable on the World Wide Web. HTML 4 is the current version of it. XML is a structured set of rules for how one might define any kind of data to be shared on the Web.