A user interface features a field explorer component comprising a list of available fields in a stored document. Certain embodiments may present the field explorer in conjunction with an existing transaction interface. In one operational mode, information may be input by selecting values from a drop menu associated with one field of the field explorer. The corresponding field of the transaction interface may be indicated (e.g. with highlighting), with the user being allowed to click/drag/drop selected data from the field explorer to that indicated field. Some embodiments may dispense with displaying the transaction interface, presenting the field explorer instead alongside a symbolic representation of a document container. In this operational mode, the user pulls the desired data from the field explorer into the container representation. If the document is persisted (e.g. as a file or on a database), an output representation (e.g. PDF) may be generated and stored.