NISO recently announced the publication of its latest Recommended Practice, CORE: Cost of Resource Exchange Protocol (NISO RP-10-2010). This Recommended Practice defines an XML schema to facilitate the exchange of financial information related to the acquisition of library resources between systems. The two systems may be within the same organization, e.g., an ILS and an ERMS, or from two different organizations, e.g., a subscription agent and a library. CORE was originally intended for publication as a NISO standard. However, following a draft period of trial use that ended March 2010, the CORE Working Group and NISO's Business Information Topic Committee voted to approve the document as a Recommended Practice.
You can read and review the CORE Recommended Practice document at: http://www.niso.org/publications/rp/#core
A standing committee has been created to monitor the uptake of the Recommended Practice, provide support and outreach on the protocol, and conduct an annual review of the document with the aim of making future recommendation for re-release as a standard publication. Anyone interested in implementing the CORE Recommended Practice, joining the standing committee, or in receiving additional information should contact NISO at email@example.com.