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A model group is used to define an element that has mixed content or element content.
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A model group is bounded by brackets, and contains at least one token.
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When a model group contains more than one content token, the child elements are controlled using two logical connector operators; sequence connector `,', and choice connector `|'
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<!ELEMENT element1 (a, b, c)> indicates a is followed by element b, which in turn is followed by c.
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<!ELEMENT element2 (a | b | c)> indicates either one can be selected.
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Combinations are possible: (a,b,(c|d)), or ((a,b,c) | d)
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