Regardless of current or future technologies, accessing digitally preserved information resources will always pose challenges. There is a plethora of models, standards and best practices addressing the different facets for the preservation of digital objects. The management of digital objects requires well-defined policies and data management plans that include all processes within their specific lifecycle. To achieve high levels of data sharing and long-term re-use of data, APARSEN recommends developing an Interoperable Framework for Persistent Identifiers, paving the way for a 'Ring of Trusted Persistent Identifiers for Linked Open Data'. To enable semantic interoperability of such a Ring, this article proposes to map LODE-BD metadata with the Framework's ontology. The Ring can be further enriched with LOD2 Technology Stack to tackle the problem of trustworthiness of linked data lifecycle while addressing the issue of Big Data. To be trusted, digital libraries need to be audited and certified in compliance with the European Framework for Audit and Certification.In a special issue of the journal ISQ Information Standards Quarterly (2010: 3) dedicated to digital preservation (DP), it was stressed that our rapidly changing digital world suffers from an over-abundance of unstructured digital information, rapid obsolescence of hardware and software, and increasingly restrictive intellectual property regimes. To ensure continued, sustainable and authentic long-term access to digital information, a vibrant international community of digital information specialists is continuously developing and implementing standards and best practices in the areas of digital curation and DP, taking into account that technological means for storage of digital information will change over time. This means that choices made early in the life of a digital project will certainly have an impact on digital posterity (Holdsworth, 2007: 7).Albeit issues regarding DP will continue to be pressing in the digital universe and despite DP policies that differ greatly across countries, the fundamental challenges regarding information resources' availability over time are universal (Henneken,

This article intends to review the underlying concepts and technologies of the Semantic Web and the potential they provide for metadata management covering bibliographic resources. To get closer to a semantic web data space, different libraries are adhering to the initiatives making their traditional Knowledge Organization Systems (KOS) operational on the web through SKOS techniques, as well as releasing bibliographic data under open licenses (open bibliographic data) and publishing it with Linked Data (LD) mechanisms. LD meaningful semantic connections create the Web of Data, a global database representing the first practical step to the Semantic Web. Here interoperable data can be processed independently of application, platform or domain, providing rich retrieval results produced by powerful query languages. From a library perspective, a problem statement is a global promotion within the Library community of understanding and of adoption of Linked Open Data (LOD), of LODe-BD recommendations, as well as releasing bibliographic data as Linked Library Data (LLD). In this way, different bibliographic datasets could become full members of the Semantic Web making interoperable different knowledge datasets of heterogeneous web communities.

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