6. The import units element information item

import units element information items (referred to in this specification as import units elements) are element information items in the CellML namespace with local name equal to units, which appear as children of import elements.

6.1. Specific information items

  1. Every import units element MUST contain a name attribute in the empty namespace. The value of the name attribute MUST be a valid CellML identifier. The value of the name attribute MUST NOT be identical to the name attribute of any other units element or import units element in the CellML infoset.
  2. Every import units element MUST contain a units_ref attribute in the empty namespace. The value of the units_ref attribute MUST be a valid CellML identifier. The value of the units_ref attribute MUST match the value of the name attribute on a units element or import units element in the imported CellML infoset. The value of the units_ref attribute MUST NOT match the value of the units_ref attribute on any sibling import units element.

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