(1) Write a well-format DTD to define the structure and legal elements/attributes of an IT company’s Web email system as

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(1) Write a well-format DTD to define the structure and legalelements/attributes ofan IT company’s Web email system as the following format:The email system contains elements of From, To, CC, Bcc, Date,Subject, Body, andAttachment. Email has “one or more” To, “zero or more” CC, “zero ormore” Bcc, “zero oronly one” Subject, and “only one required” Body. From and Date arealso required.(2) According to the DTD from your answer in the subquestion (1),write an instanceof the XML document that contains an email’s information.