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units-element-item.rst

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The units element information item

units element information items (referred to in this specification as units elements) are element information items in the CellML namespace with local name equal to units, and with either a model element or a component element as their parent.

Specific information items

  1. Every units element MUST contain a name attribute in the empty namespace. The value of the name attribute MUST be a valid CellML identifier.
    1. Where the parent of the units element is a model element, the value of the name attribute MUST NOT be identical to the name attribute of any other units element child of that model element, or of any import units element in the CellML infoset.
    2. Where the parent of the units element is a component element, the value of the name attribute MUST NOT be identical to the name attribute of any other units element child of that component element.
    3. In any case, the value of the name attribute MUST NOT be equal to a cell in the name column of the :ref:`built-in-units` table.
  2. A units element MAY contain a base_units attribute in the empty namespace. If present, the value of the base_units attribute MUST be equal to either yes or no. If the attribute is present and equal to yes, then the following paragraph does not apply.
  3. A units element MAY contain one or more unit element children.