From the document:
The OASIS Universal Business Language (UBL) is intended to help solve these problems by defining a generic XML interchange format for business documents that can be extended to meet the requirements of particular industries. Specifically, UBL provides the following:
A library of XML schemas for reusable data components such as “Address,” “Item,” and “Payment” — the common data elements of everyday business documents.
At the core of conceptual modeling is the idea of a model. The Wikipedia defines a model as "an abstract (or actual) representation of an object or system from a particular viewpoint". [ Note: this definition has changed, but I still like the old version ]
There are three parts to the definition above - an object or system, a representation and a viewpoint. It is critical to understand the role of each element of a model.
Link to the conceptual modeling section of the rule based systems tutorial.
"This model will be a simplification and an idealization, and consequently a falsification."
- Alan M. Turing