The wink XML language is part of Wanda XML. It encodes virtual ink (also called electronic ink), as recorded, for instance, by a digitizing tablet. It is inspired by the InkXML standard and by the Unipen standard. Using wink, one can encode standalone virtual ink documents or superimpose virtual ink on top of raster images. In this last case, a wink document may be included into a wandoc document. The modalities of superposition of the ink on top of the image are defined by the tag <trace_context/> tag. A wink encoded handwriting sample may be divided into subsets grouped by the tag <data_block/>, each having a different <trace_context/>.