Gateway computer system with intermediate data processing according to rules that are specified by templates

A computer program product for communicating data between computer systems, the computer program product being tangibly embodied on a non-transitory computer-readable storage medium on a computer, wherein the computer is a data modification engine in a gateway computer that is communicatively connected between computer systems in the functions of a source computer system and of a target computer system, and comprising instructions that, when executed by the computer, are configured to cause the computer to:

• receive an original data package from the source computer system, the original data package having a plurality of elements that are arranged according to a pre-defined data-structure,
• access a rule template that is associated with the pre-defined data structure and that provides a plurality of pre-defined rules;
• separate the original data package into the plurality of elements according to the pre-defined data-structure;
• process the plurality of elements by digitally transforming at least some of the plurality of elements according to the plurality of pre-defined rules to processed elements, wherein the data modification engine:
• applies at least a sub-set of the pre-defined rules to particular original elements having indicators that represents data to be processed,
• differentiates an original action indicator and an original argument indicator, with the original action indicator indicating an action to be performed by the target computer system,
• evaluates the original action indicator in combination with the original argument indicator to determine availability or non-availability of the target computer system to perform the action that is indicated in the original action indicator,
• in case of non-availability, receive an alternative argument that corresponds to the original argument indicator by interacting with the target computer system or by interacting with an index storage that is accessible to the data modification engine and perform the action by the data modification engine;
• combine the processed elements according to the pre-defined data-structure to a modified data package;
• and
• send the modified data package to the target computer system.

A gateway computer that is adapted to be communicatively connected between computer systems in the functions of a source computer system and of a target computer system, the gateway computer comprising a data modification engine that is adapted to communicate data by

• receiving an original data package from the source computer system, the original data package having a plurality of elements that are arranged according to a pre-defined data-structure,
• accessing a rule template that is associated with the pre-defined data structure and that provides a plurality of pre-defined rules;
• separating the original data package into the plurality of elements according to the pre-defined data-structure;
• processing the elements by digitally transforming at least some of the elements according to the plurality of pre-defined rules to processed elements, wherein the data modification engine:
• applies at least a sub-set of the pre-defined rules to particular original elements having indicators that represents data to be processed,
• differentiate an original action indicator and an original argument indicator, with the original action indicator indicating an action to be performed by the target computer system,
• evaluates the original action indicator in combination with the original argument indicator to determine availability or non-availability of the target computer system to perform the action that is indicated in the original action indicator,
• in case of non-availability, receive an alternative argument that corresponds to the original argument indicator by interacting with the target computer system or by interacting with an index storage that is accessible to the data modification engine and perform the action by the data modification engine;
• combining the processed elements according to the pre-defined data-structure to a modified data package;
• and
• sending the modified data package to the target computer system.