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Keyword ELEMENT Introduces a new element <!ELEMENT title .........>
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Element name must begin with a letter, and may additionally contain digits and some punctuations, i.e. `.', `-', `_', and `:'
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If an element can hold no child elements, and also no text, then it is known as empty element and denoted by EMPTY
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An element declared to have a content .of ANY may contain all of the other elements declared in the DTD
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<!ELEMENT p ANY> <!ELEMENT image EMPTY>
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Empty element usage: <image></image> or <image/>
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