Unfortunately, there is no industry standard for the "Pro" label. Some foundries (like FontFont) use it to mark fonts with extra language support beyond basic Latin (which was Adobe’s definition when they coined the term in the early 2000s), but others use it to distinguish a font with extra OpenType features, such as alternates, ligatures, and even small caps.
So, I suppose you could ask for Adobe’s Std/Pro structure, but it would only reliably apply to Adobe fonts.
Modify it to fit your own situation. Later Adobe Latin sets contain characters that are for specialized uses which you may not need. IIRC, Adobe uses Latin 3 as their "Std" basic so you could start there.
Comments
So, I suppose you could ask for Adobe’s Std/Pro structure, but it would only reliably apply to Adobe fonts.
I guess I'll follow Adobe for now.
Another question, yay or nay to PUA?
http://www.underware.nl/latin_plus/
Modify it to fit your own situation. Later Adobe Latin sets contain characters that are for specialized uses which you may not need. IIRC, Adobe uses Latin 3 as their "Std" basic so you could start there.
As for PUA, no.