This class describes rules which can be used to tune process of copy encoding data for cases when TrueType symbolic font has more than one encoding. Some PDF documents after conversion into PDF/A format could have error 'More than one encoding in symbolic TrueType font's cmap'. What is a reason of this error? All TrueType symbolic fonts have special table 'cmap' in it's internal data. This table maps character codes to glyph indices.

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And this table could contain different encoding subtables which describe encodings used. See advanced info about cmap tables at Usually cmap table contains several encoding subtables, but PDF/A standard requires that only one encoding subtable (3,0) must be leaved for this font in PDF/A document. And key question here - what data must be taken from another subtables to copy into destination encoding table (3,0)? Majority of fonts have 'well-formed' cmap tables where every encoding subtable is fully consistent with another subtable. But some fonts have cmap tables with collisions - where for example one subtable has glyph index 100 for unicode 100, but another subtable has glyph index 200 for the same unicode 100. To solve this problems special strategy needed. By default following strategy used: mac subtable(1,0) is looked for.