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<!ELEMENT body ((a | p | h3 | h) | (meta, (h | f))> <body> Text </body> In above example user ommited required element but validate action reports required content model instead of simply requiring missing element. Very hard to understand for complex and unknown content models. Source: Martin (he can give exact example)
e.g. <head> requires only title. It's tigthly related to grammars.