5. The import element information item

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

5.1. Specific information items

1. Every import element MUST contain an attribute information item in the namespace http://www.w3.org/1999/xlink, and with local name href. The value of this attribute SHALL be a valid locator href, as defined in section 5.4 of the XLink specification. The href attribute SHALL be treated according to the XLink specification, by applying the rules for simple-type elements. When describing an import element or one of its children, the phrase “imported CellML infoset” SHALL refer to the CellML infoset obtained by parsing the XML document referenced by the href attribute.
2. Every import element MAY contain zero or more specific information children, each of which MUST be of one of the following types:
   1. An import units element; or
   2. An import component element.
3. The imported CellML infoset SHALL NOT be equivalent to this CellML infoset. Any CellML infoset imported, directly or indirectly, by the imported CellML infoset SHALL NOT be equivalent to this CellML infoset.