Qualifiers that follow a person’s name, for example, “Sr.”, “Jr.”, “III”, “3rd”, etc.
The <suffix> element should be used for parts of people’s names, not for degrees, such as Ph.D. or DDS. The academic degrees are part of the information that is known about a contributor, not part of the name of the contributor, and should take the <degrees> element. Degree and certification information should be placed directly following the person’s name within the contributor information:
<contributor ...> <name> <surname>Smyth-Jones</surname> <given-names>George</given-names> <suffix>Sr.</suffix> </name> <degrees>PhD</degrees> </contributor>
<!ELEMENT suffix (#PCDATA %suffix-elements;)* >
Text, numbers, or special characters, zero or more
... <string-name> <surname>Moellering</surname> <given-names>R. C.</given-names> <suffix>Jr.</suffix> </string-name> ...