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| <code>doctype-system</code>
| Introduces the output with a document type declaration and the given system identifier(e.g.: <code><!DOCTYPE x SYSTEM "entities.dtd"></code>).
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| <code>doctype-public</code>
| If <code>doctype-system</code> is specified, adds a public identifier(e.g.: <code><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"></code>).
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