cbroschinski
commented
1 year ago type may in fact occur more than once. In our currenct XML implementation type (together with currency) is a mandatory attribute to the amount_paid element, which itself can have mutiple occurences (Here's an example). This was somewhat misleading in previous versions of the schema description, we have now tried to make it more clear.
As we need to be able to divide the costs into APC, page charges et al. Then of course only the first field should be required (the others optional) - or in combination with "amount_paid" (also only once required).
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