01450nas a2200241   4500000000100000000000100001008004100002260001200043653001500055653001900070653001100089653001700100653000900117100003800126700002000164700002000184245009400204856009800298300000900396490000600405520078300411022001401194       2013                            d  c12/201310aOntologies10aDecision-level10a(6517)10aAdaptability10aMPEG1 aFernando Carlos López Hernández1 aJosé Martínez1 aNarciso García00aCAIN-21: Automatic adaptation decisions and extensibility in an MPEG-21 adaptation engine  uhttp://www.ijimai.org/journal/sites/default/files/files/2013/10/ijimai20132_4_1_pdf_14413.pdf  a7-240 v23 aThis paper presents the progress and final state of CAIN-21, an extensible and metadata driven multimedia adaptation in the MPEG-21 framework. CAIN-21 facilitates the integration of pluggable multimedia adaptation tools, automatically chooses the chain of adaptations to perform and manages its execution. To drive the adaptation, it uses the description tools and implied ontology established by MPEG-21. The paper not only describes the evolution and latest version of CAIN-21, but also identifies limitations and ambiguities in the description capabilities of MPEG-21. Therefore, it proposes some extensions to the MPEG-21 description schema for removing these problems. Finally, the pros and cons of CAIN-21 with respect to other multimedia adaptation engines are discussed.  a1989-1660