The element definition for <rs> includes @type but does not give any suggested values (cf. the definition of <fw>). A few values are given in examplesa in the Guidelines, but sometimes seemingly simlilar concepts are expressed with different values (such as type="org" and type="organization"). For ease of interchange of texts, it would be good to recommend certain values, giving explanations of what these are intended for (as in the definition of <fw>).
For background, see http://listserv.brown.edu/archives/cgi-bin/wa?A2=ind1009&L=TEI-L&T=0&F=&S=&P=176 .