... insert, or nest, one tag within another, pay attention to the order in which you open each tag, and then close them in the reverse order. If you open element A and then element B, you must first ... application. The tag is a piece of text contained within left and right angle brackets (< >). The markup is completed by placing, or opening, a tag at the beginning of the content and then closing ... </xsd:complexType></xsd:element>SGML SGML stands for Standard Generalized Markup Language. The mother of all markup languages, it was developed during the 1970s and ’80s as a standard to facilitate the transfer of structured...