13. The relationship_ref element information item

relationship_ref element information items (referred to in this specification as relationship_ref elements) are element information items in the CellML namespace with local name equal to relationship_ref.

13.1. Specific information items

  1. Every relationship_ref element MUST contain exactly one attribute information item with local name relationship. This limit of one attribute information item SHALL apply without regard to the namespace in which the attribute information item is, and SHALL, to the extent that it conflicts, override the ordinary rules for extension information items.
  2. In the event that the relationship attribute is in the empty namespace, it MUST either take the value encapsulation or containment.
  3. There MUST NOT exist a sibling relationship_ref element such that the namespace of the relationship attribute on the sibling element is identical to the namespace of the relationship attribute on this element, and the value of the relationship attribute on the sibling element is identical to the value of the relationship attribute on this element.
  4. A relationship_ref element MAY contain an attribute in the empty namespace with local name name. In this case, it MUST NOT have a relationship attribute in the empty namespace with value encapsulation. The value of the name attribute MUST be a valid CellML identifier.

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