Blueprint changed by Christopher Adams:

Whiteboard set to:
The input to the database is all provided by fontaine:
http://fontaine.sourceforge.net/

The relevant tables and values are:

font_metadata: id, file_id, file_name, upload_user, date, common_name,
native_name, sub_family, style, weight, fixed_width, fixed_size,
copyright, license, license_url, glyph_count, character_count,
fontaine_report

orthographies: id, font_id, common_name, native_name, support_levelchar,
percent_coverage, missing_values

====

Fontaine will check the font's glyph coverage for many language
categories such as Western Latin, Chinese, Euro, etc.

It will then indicate whether the support for each language is Full,
Partial (>80%), Fragmentary or None. For fonts with Partial or
Fragmentary support, Fontaine will list the missing glyphs.

The purpose of this feature is to not only list what languages are
supported, but to show other type designers what work still needs to be
done to give the font better glyph coverage.

However, I am trying to weigh the utility of displaying missing glyphs
for orthographies with fragmentary support.

This is why:

According to Fontaine, Open Baskerville has full support for Basic Latin
and partial support for Western Latin. For the latter, the support level
is 96% and the missing glyphs are U+00c7 (Ç), U+00e7 (ç).

Excellent, I think! Now some budding type designer can help push Open
Baskerville to 100% glyph coverage for Western Latin by drawing a nice
cedilla and hanging it on two glyphs!

But now we turn to Open Baskerville's support for Pan African Latin,
which stands at 19%. The task of filling in the other 81% might not seem
so daunting until we realize it calls for another 194 glyphs!

>From the perspective of usability, what we are confronted with in this
last case is a great deal of data of eminently little value (even to
other type designers). The original OFLB avoided this problem by hiding
exact glyph coverage inside a drop-down widget. But in my mind this is
merely sweeping the data under the proverbial rug.

I expect that many of you will react with, "If we have all that data on
hand, then we should show it." I want to counter with the proposal that
we can afford to be a bit more stringent, and only display missing
glyphs for Partial orthographies.

Not to put too fine a point on it, but many fewer additional glyphs are
needed to give Open Baskerville full Dutch support than Pan African
Latin support. What is the argument for not displaying those, while
displaying the Pan African ones?

-- 
Need a mapping of glyph coverage
https://blueprints.launchpad.net/openfontlibrary/+spec/glyph-coverage

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