Fonts not validating mac
Several introductory and tutorial articles on the Extensible Markup Language (XML) are referenced in the shorter XML Introduction document. "The Extensible Markup Language (XML) is the universal format for structured documents and data on the Web." -- W3C XML Web site, 2000-07-06.
The Extensible Markup Language (XML) is descriptively identified in the XML 1.0 W3C Recommendation as "an extremely simple dialect [or 'subset'] of SGML" the goal of which "is to enable generic SGML to be served, received, and processed on the Web in the way that is now possible with HTML," for which reason "XML has been designed for ease of implementation, and for interoperability with both SGML and HTML." Note that the "HTML" referenced in the preceding sentence (bis) means HTML 4.0 and 3.2 which were in common use as of 10-February-1998, when the XML 1.0 specification was published as a W3C Recommendation.
I wrote before Christmas that I was making the font validator run standalone as mac os X command line binary, no need to install mono separately. There is a Font Val-Mac OSX-*under(current 2016-01-06): Font Validator/ If you have an up to date freetype (from macport/homebrew, Xquartz[? If you have a vanilla mac os X box without any of those, you set DYLD_LIBRARY_PATH to where you unpack the "Darwin" subdirectory - there are just 3 files, the binary, and a subdirectory of up to date freetype dylib, and libpng (which freetype depends on), which you don't have to use.
However, Font Book is still limited in what it can detect, and even when fonts are found to be valid there still may be problems.
Doing so won’t prevent problems down the road, but it will help ensure you are not installing problem files.
You accomplish this using Font Book which has been included as part of your operating system since OS X 10.3.
Global font management has been desired for years, and while there have been advances, no solution encompasses everything.
This is mainly because companies that develop applications which extensively use fonts tend to use their own font organization techniques (ie, storage locations).