CAS numbers need to be validated for the ~4000 chemical pages. Since the only authoritative source is the American Chemical Society, SciFinder looks like the best bet. For various reasons (see previous IRC discussions), it is not practical for one editor to validate them all.
W3C Markup Validation Service, a free service that checks Web documents in formats like HTML and XHTML for conformance to W3C Recommendations and other standards.
The JGoodies Validation helps you validate user input in Swing applications and report validation errors and warnings. It has been designed to work with different architectures and programming flavors.
C. Cheng, G. Nührenberg, C. Huang, and H. Ruess. (2017)cite arxiv:1710.03107Comment: Version 2: add proofs for hardness of PTAS approximability, remove experiments on randomized examples and some not-so-important optimizations.
C. Chang, R. Stachowitz, and J. Combs. Tools for Artificial Intelligence, 1990.,Proceedings of the 2nd International
IEEE Conference on, (November 1990)