opentype layout(GPOS table)

Hi all,

Now I'm trying to implement indic language by using opentype font. And I know less about opentype, and just know that the opentype layout(GSUB and GPOS) helps shape and combine indic characters.
I have read opentype specification, but i'm not very clear about it.
I want to ask that how GPOS table works, Does it generate the absolute coordinate for indic characters or the relative coordinate(offset to previous glyph)?

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