BoM Moniker

A Moniker is a name for something, in this case a Widget. A widget is a DGN element. BoM uses a moniker to display the widget ID along with other information as required.

Suppose the widget ID is a number, such as 101. Successive widgets may have their ID incremented to 102, 103, etc. If you want to display just that ID, then you can instruct that to appear using a basic expression. You may want to prefix the ID with W for widget, which needs a marginally more complex expression.

More about Monikers

You can read more about monikers.

Drawing Number obtained from DGN Model

Suppose that your DGN file contains multiple models, and each DGN model is an assembly schematic. You can assign a schematic ID to each model by creating an Item Type library named Catalog, having an Item Type named Drawings and a SheetId property. Then you can use the model Drawings.SheetId in your BoM moniker.

Example Expressions used in a Moniker

Example Moniker Expressions

Moniker	Expression	Sample
Widget ID	this.id	101
Drawing ID	this.GetModel().GetItem("Catalog:Drawings").SheetId	123-456
Widget and Drawing IDs	this.GetModel().GetItem("Catalog:Drawings").SheetId & "W" & this.id	123-456 W101

Expressions

Expressions are part of MicroStation. They were introduced with MicroStation CONNECT Update 15. An expression is able to perform arithmetic calculations as well as primitive text processing.