How many XML languages are produced each year?

["Costello, Roger L." <costello@mitre.org>]

Hi Folks,

Do you have an estimate of how many XML languages are written and put into use annually?

By comparison, the estimated number of mathematical theorems published yearly in mathematical journals is 200,000. [1]

/Roger

[1] By multiplying the number of math journals by the number of yearly issues, by the number of papers per issue and the average number of theorems per paper, a couple of mathematicians arrived at the estimate of 200,000 theorems a year. [Source: The Mathematical Experience by David, Hersh, and Marchisotto]