What is the difference between the PRISM Specification and PRISM Aggregator Message (PAM)?
PAM is a specific use of PRISM. PAM consists of a subset of PRISM elements combined with XHTML for encoding text. PRISM can be XML, XML/RDF, or XMP, but PAM is XML only. While both PRISM and PAM are sets of XML elements, only PAM has a DTD and an XSD with which XML files can be validated. See the PAM Guide.