Proposal: .OTC filename extension recommendation

[Sairus Patel]

Thomas Phinney wrote:

> Surely that should be ", unless they are in an OpenType Collection."



A good suggestion. I'd noticed that but was trying to propose as few edits as possible.



=== Here is the revised item 8 that takes Thomas' feedback into account:





8. { Replace the current contents of the "Filenames" section: }



OpenType fonts may have the extension .OTF or .TTF, depending on the kind of outlines in the font and the creator's desire for compatibility on systems without native OpenType support.



    * In all cases, fonts with only CFF data (no TrueType outlines) always have an .OTF extension.

    * Fonts containing TrueType outlines may have either .OTF or .TTF, depending on the desire for backward compatibility on older systems or with previous versions of the font. TrueType Collection fonts should have a .TTC extension whether or not the fonts have OpenType layout tables present.



{ by: }



OpenType font files should have the extension .OTF, .TTF, .OTC, or .TTC depending on the kind of outlines in the font and desired backward compatibility.



    * A standalone font file (i.e. one that is not part of an OT Collection) with CFF outlines should have filename extension .OTF.

    * A standalone font file with TT outlines should have filename extension .OTF or .TTF, depending on the desire for backward compatibility with older software or with previous versions of the font.

    * An OpenType Collection font file should have filename extension .TTC or .OTC whether or not the fonts have OpenType layout tables present, and regardless of the kinds of outlines present. The .OTC extension recommendation was introduced in OpenType specification version 1.7, so .TTC may be used for CFF OT Collections if needed for backward compatibility with older software that was not aware of the .OTC extension.



In all cases, software must determine the kind of outlines present in a font not from the filename extension but from the contents of the file.





Sairus



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