YPFS Definition

A list of goods sent or services provided, with a statement of the sum due for the list of items; a bill.

How to Identify Author

The company sending the invoice for goods purchased or services rendered. And the company being billed.

How to Identify Publisher

Typically this will be the company sending the invoice for goods purchased or services rendered, however check the headers and footers, other fine print to determine if this document was published by an institution outside of the transaction, like a court.

Node Naming Convention 

Use title as provide or some variation of the following naming convention:  Invoice from [Seller] to [Buyer] for [Details of transaction]