A tag is placeholder used to indicate business object-specific information inside document templates, presentations, reports and other elements containing text. When a document is generated from a template in the operation mode, or a presentation is displayed, the tag is replaced with actual data taken from business objects. For example a template for a customer letter may start with a line that includes a tag:

Dear <<Customer.Name>>,

When a letter is generated for a customer in the operation mode the tag will be replaced with the actual customer name.