Have it your way
Everyone wants something different
Developers building 'standard' vocabularies face a constant battle with diverse (and changing) needs. Even participants with seemingly identical roles in transactions may have substantially different expectations about the information they use to perform those transactions.
Some need to see the same thing differently
To some extent, variations in perspective can be explained by different roles. The amount on a check, while remaining the same number, has a different meaning to an accounts payable person issuing a check than it does to an accounts receivable person noting the arrival of the check. To some extent, shared understandings ease this, but tougher cases are common, especially in complex multi-party transactions.
Others need to see different things the same
Payroll and reimbursement checks are different things when they're being issued, but similar things when they hit the bank account.
Connecting different views
XML documents provide enough information about their content that building multiple views from a single XML document source (or even multiple documents) is a common and fairly simple task.
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