Universal Business Language
This library is created for the purpose of using Invoice UBL.
Other elements can be added and PR's are welcomed.
If there is a need in the future I will cover more.
Schemas are covered as they are described in the http://www.datypic.com/sc/ubl21/t-ns39_InvoiceType.html
Example
./bin/buildUBLElement.php AnticipatedMonetaryTotal cac MonetaryTotalType CACType