The WWP uses <rs> only in special circumstances. Most of its uses in running prose have been replaced by the WWP element <mcr> (see 056). Instead of <rs type="printer"> and <rs type="bookseller"> the WWP now uses <docrole>. Instead of <rs type="source"> in the <sourceDesc>, the WWP now uses <idno>.
The WWP uses <rs> in tables of contents to encode the title of each item (chapter, etc.).