Edit online

A schema diagram contains a series of interconnected components. To quickly identify the relation between two connected components, the connection is represented as:
  • A thick line to identify a connection with a required component (in the following image, <family> is a required element).

    Figure 1. Example: Required Component
  • A thin line to identify a connection with an optional component (in the following image, <email> is an optional element).

    Figure 2. Example: Optional Component
The topics in this section provide details about all of the available components and their symbols as they appear in an XML schema diagram.