Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for receiving a first document, the first document being associated with a user, executing a plurality of parsers, each parser of the plurality of parsers processing the first document to provide one or more first data values, merging the one or more first data values provided from the plurality of parsers to populate a data record having one or more data fields, the data record being specific to the user, and storing the data record in computer-readable memory.