The Numerical Algorithms Group (NAG http://www.nag.co.uk), develops and provides world-leading software to solve complex mathematical problems. It has offices in the UK, Germany, Japan and the US and has created a world-wide collaborative network of the world’s best mathematical experts. In 1971 NAG developed the first mathematical software library that now has over 10,000 users world-wide and contains over a thousand mathematical and statistical functions. The range of products and services that NAG offers has continually expanded into statistical, symbolic, visualization and numerical simulation software, compilers and application development tools and wide-ranging consultancy. Recently NAG has launched a product (N-SEA) for teaching statistics based on part of the UK national curriculum for schools.

To support its products and tailor them to particular users’ requirements, NAG has adopted XML technologies for both software documentation and as a means of representing abstract specifications of software components. In addition NAG coordinated the OpenMath-TN and MONET projects, and is a member of the W3C Math Interest Group. The documentation of the NAG Library consists of over 7000 A4 pages and contains more than a quarter of a million mathematical expressions, and has evolved from plain text via typesetting languages such as TSSD and LaTeX to XML, so NAG has a wealth of relevant experience of maintaining and translating mathematical legacy documentation.