Support XML files without declaration.
XML 1.0 spec allows content without explicit declaration, but the current sax parser always expect the declaration to be present. We need to make that optional, and assume XML 1.0 if the declaration is absent.
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XML 1.0 spec allows content without explicit declaration, but the current sax parser always expect the declaration to be present. We need to make that optional, and assume XML 1.0 if the declaration is absent.