<put algortithm description here>
Sand
[raster]Optional.
<put parameter description here>
Silt
[raster]Optional.
<put parameter description here>
Clay
[raster]Optional.
<put parameter description here>
Soil Texture
[raster]Sum
[raster]processing.runalg('saga:soiltextureclassification', sand, silt, clay, texture, sum)