1. A method for grouping style characteristics of paragraphs in a fixed format document, the method comprising: receiving property data associated with each paragraph; grouping each paragraph of the fixed format document into one or more style clusters based on a first property; sub-dividing style cluster into sub-groups based on a second property, wherein the second property is different from the first property; and for each sub-group, normalizing a third property for each paragraph in each sub-group, wherein the normalizing is based, at least in part, on a dominant one of the at least the third property.