Abstraction and/or integration can be performed on information, e.g. transaction data items in standard and/or proprietary formats, using data processing systems. For example, standard-based abstraction operations can analyze transaction data items in standard format to obtain transaction segment data items, each about a transaction segment; transaction segment data items can be used to obtain and store segment group data structures, each about a type of transaction segment data items and which can also include standard-based abstraction artifacts. Abstraction operations on standard or proprietary format can automatically extract pre-integration information, such as usage attributes, useful in integration and for other purposes. Integration can be performed on transaction type attribute data, producing merged attribute data including mapping attributes, such as based on match results from associated fields of selected transaction types in different formats. Attribute data items being integrated can include pre-integration information and segment group data structures with standard-based abstraction artifacts.