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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: Example: Required Component

  • A thin line to identify a connection with an optional component (in the following image, email is an optional element).

    Figure: Example: Optional Component

The following topics explain in detail all available components and their symbols as they appear in an XML schema diagram.