DUNSnumber must be 1 to 13 characters This type represents an ESIID. It is bound to alpha-numeric characters, 8 to 36 in length. Market Participant is extended from Company Financial Institution is extended from Company This content object contains Address, Phone, and Email contact info Address (address, street(s), city, state, zip or postal, country) Phone is bound to ten digit number with optional parenthesis and dashes This is the email object. Its data is bound to an expression that allows both IP addresses and regular domains. In the case of an IP address it makes sure that it is no more than 255 for each part. Matches: [john@doe.com], [john.doe@[255.008.09.090]], [john-doe.i.am@john-doe.i.am.com] Non-Matches: [john@doe], [my.name..@john.doe], [wow@-john-doe-.com] This represents an ESI.