In chunked transfer encoding, the data stream is divided into a series of non-overlapping "chunks". Tuna may be processed and labeled as "solid", "chunked" ("chunk") or "flaked". The "chunked" keyword in the Transfer-Encoding header is used to indicate chunked transfer. The underlying mechanism for this approach is chunked transfer encoding. An early form of the chunked transfer encoding was proposed in 1994. Oracle GeoRaster offers chunked storage of 2-D raster maps, albeit without SQL integration. ODT and DOCX, being PKZIP-based are chunked and also carry a directory. TZX is a chunked format with similar scope for the ZX Spectrum series. Long, seemingly monomorphemic words also are chunked in English for purposes of pronunciation.