pdf to xml (Python) -- 2

This is the next step of my previous project. So the code basically converts the pdf's into xml ( with desired tags) The code is ready for one transportation document and now i have other 2 transportation documents. What i need is that the same code should should be modified in order to convert automatically for the other 2 transportation documents (pdf's) into xml. At the end there is one unique xml file, so at the end the code will convert all the 3 types of transportation documents inside the unique xml output file ( with same tags). Well i can explain the details or the points which are not really clear.