With Document AI, is the algorithm learning the location of the labels or the structure? I have a few documents and the content/fields are the same in the document, but sometimes the order is changed so would a Custom Document Extractor be applicable to this situation? Is the model being taught to look for a label in a specific location/position, thus making it bad at handling situations where the order or positioning of some field is changed? Also is there any Documentation for how the model actually works?