I am not clear about the <complexcontent> ,<extension> tagslike if i have <prod id="123">abcd</prod>the schema for this complex element is something like this<element name prod><complexType><simplecontent><extension base=string>.......here extension tag is used to describe the body content abcd is stringbut how ever in complex content when we use this tag i couldn't understandsay example in w3schools<xs:element name="employee" type="fullpersoninfo"/><xs:complexType name="personinfo"> <xs:sequence> <xs:element name="firstn