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If the content model of a particular element foo is described as transparent, it means:
- when element foo is a child of a parent element bar whose content model is allowed to contain flow elements, then the contents of element foo may also contain flow elements
- when element foo is a child of a parent element baz whose content model restricts its child elements to only being phrasing elements, then any child elements of element foo are also restricted to only being phrasing elements.