[tei-council] Validation errors in the Guidelines HTML output

Hi all, I just discovered the VNU HTML validator, and I'm using it on another project; just for fun I ran it on a clean Guidelines build, and there seem to be about 150 errors, mostly minor and easily fixable. But it caused me to wonder why our build process didn't catch them, and I'm going to look into that. Validating modern HTML is notoriously difficult, but we should do the best we can, I think. Cheers, Martin