Practical digital library interoperability standards

As the field of digital libraries matures and new systems and standards develop, the ability to interoperate between systems becomes paramount. This article gives an introduction to many recent standards and de facto standards for interoperability, and illustrates them using open source digital library software. Core standards that are discussed include Dublin Core, OAI-PMH, METS, and MODS. We use interoperation between Greenstone and DSpace as a motivating case study