11. A method that utilizes a multi-pass technique to validate extensible markup language (XML) documents comprising: receiving an XML document containing a plurality of data items, wherein the plurality of data items are arranged in a predetermined format for an exchange of data; ascertaining a set of processing parameter from the XML document, wherein responsive to any missing preprocessing parameter in the set of preprocessing parameters, determining that the XML document to be invalid, wherein a result of determining that the XML document is invalid causes a ceasing of activities related to validation, and wherein the preprocessing parameters represent at least one of data tags and values within the XML document; upon determining the set of preprocessing parameters, determining a validation sequence for the XML document from a plurality of different validation sequences, wherein the validation sequence is determined based at least in part upon the set of processing parameters, wherein each of the validation sequence comprises a unique order of execution for a series of validation passes, wherein the validation sequence comprises a plurality of validation elements that each defines acceptable data items for at least one of the predetermined format and for the exchange of data, wherein each validation pass is configured to validate the XML document for a condition defined by the validation element; and executing the series of validation passes associated with the validation sequence upon the XML document, wherein during the execution, a validation pass for each validation element is executed in order.
11. A method that utilizes a multi-pass technique to validate extensible markup language (XML) documents comprising: receiving an XML document containing a plurality of data items, wherein the plurality of data items are arranged in a predetermined format for an exchange of data; ascertaining a set of processing parameter from the XML document, wherein responsive to any missing preprocessing parameter in the set of preprocessing parameters, determining that the XML document to be invalid, wherein a result of determining that the XML document is invalid causes a ceasing of activities related to validation, and wherein the preprocessing parameters represent at least one of data tags and values within the XML document; upon determining the set of preprocessing parameters, determining a validation sequence for the XML document from a plurality of different validation sequences, wherein the validation sequence is determined based at least in part upon the set of processing parameters, wherein each of the validation sequence comprises a unique order of execution for a series of validation passes, wherein the validation sequence comprises a plurality of validation elements that each defines acceptable data items for at least one of the predetermined format and for the exchange of data, wherein each validation pass is configured to validate the XML document for a condition defined by the validation element; and executing the series of validation passes associated with the validation sequence upon the XML document, wherein during the execution, a validation pass for each validation element is executed in order. 12. The method of claim 11 , further comprising: when a failure of a specific validation element occurs during an execution of the validation sequence, immediately terminating the execution of the validation sequence and determining the XML document to be invalid; when each validation element has been processed and determined to be valid, determining the XML document to be valid; and conveying message detailing validation results for the XML document to an originating party of the XML document.