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Revision as of 04:04, 26 January 2008 by (Talk | contribs) (R-Card Functionality)


This page provides the Higgins definition of an r-card ("relationship card").

R-Card Functionality

An r-card is a superset of the functionality of an m-card as defined by the MS ISIP specification. The differences are:

  • Both r-cards and m-cards include a pointer to the issuer's STS for obtaining a security token.
  • An r-card includes a second pointer: a Higgins Relation to the Digital Subject to which the r-card applies. This relation is provisioned by the r-card issuer, and points to the Digital Subject in the Context designated by the issuer.
  • An r-card capable Selector receiving this r-card can resolve the ContextId of the Relation (see that page for details) to discover the Context Provider configuration metadata necessary to communicate with this context.
  • R-card data sharing relationships will work with any Context to which the Selector accepting the r-card can speak. For the greatest interoperability, r-card issuers can use Contexts specifically designed for generalized cross-domain data sharing such as XDI.

R-Card Extension to the M-Card Schema

The only extension necessary is a single element, Relation, from the Higgins namespace. Following are examples of such an element:



RelationXRI (using XRI 2.0 syntax):


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