Arbortext IsoDraw > Extensions > BOM XML Reference > Generating and Updating Callouts from a BOM XML File > About the BOM XML File, Callouts, and Linking
  
About the BOM XML File, Callouts, and Linking
An Arbortext IsoDraw BOM XML (*.xml) document is a structured list of the items that are referenced by callouts in an illustration. In Arbortext IsoDraw, you can generate callouts for an illustration from a BOM XML file.
You can link (connect) callouts to objects when you generate them. (For more information, see “Callouts Connected to Objects” in the PTC Arbortext IsoDraw User's Reference.) You can also link the illustration file to the BOM XML file when you generate callouts. When you link the BOM XML file, callout and object information in the illustration can update automatically when the BOM XML file changes.
Use the BOM XML file description, XML schema, and XML examples in this topic to help you create a valid BOM XML file. Then, follow the instructions at the end of this topic to perform the following tasks:
Generate new callouts in your illustration from a BOM XML file. (See To Generate Callouts from a BOM XML.)
Update callout and object information by editing a linked BOM XML file. (See Editing a Linked BOM XML File to Update Illustration Callouts.)