Party ID and GlobalID should be a set of numbers

[Frosch411]

The definition of ID and GlobalID of seller, buyer and other partys is defined as "0 .. unbounded", so there should be able to write more than one ID and more than one GlobalID for an address.

Here is an example of a valid invoice (EXTENDED format):

ram:ApplicableHeaderTradeAgreement
ram:BuyerReference378149</ram:BuyerReference>
ram:SellerTradeParty
ram:IDB 2017</ram:ID>
ram:IDDE811135476</ram:ID>
ram:ID316239045</ram:ID>
ram:ID4399901831414</ram:ID>
<ram:GlobalID schemeID="0206">B 2017</ram:GlobalID>
<ram:GlobalID schemeID="0223">DE811135476</ram:GlobalID>
<ram:GlobalID schemeID="0060">316239045</ram:GlobalID>
<ram:GlobalID schemeID="0088">4399901831414</ram:GlobalID>
...

It would be great if further versions of ZUGFeRD-csharp can write and read more ID's per party.