All publications

@conference{Kapidakis2020,

title = {Consistency and Interoperability on Dublin Core Element Values in Collections Harvested using the Open Archive Initiative Protocol for Metadata Harvesting},

author = {Kapidakis, S.},

url = {https://www.scitepress.org/Papers/2020/101120/101120.pdf},

isbn = {978-989-758-474-9},

year  = {2020},

date = {2020-11-04},

booktitle = {Proceedings of the 12th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management (IC3K 2020)},

journal = {Proceedings of the 12th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management (IC3K 2020},

volume = {2},

pages = {181-188},

abstract = {When resource descriptions use the exact same value for an entity, this value is easier parsed, identified and utilized by automatic procedures. The use of controlled values, even when it is common and very useful, it is usually not enforced during the data entry. In this paper we study the use of the controlled values in many harvested collections and we study all Dublin Core elements and also their similarity. We mainly focus in the element language, as there is a lot of standardization on how to denote language values, followed by other elements that normally use controlled values. We discovered values that are repeated many times and in many collections and many more values that are used only once! The lack of coordination among collections during their creation results to many variations for each value, even when the value is used consistently and many times inside a collection. The study uses dendrogram to reveal the current usage of the Dublin Core elements inside and among active collections by clustering the collections with similar values and helps adopting better guidelines, designing better tools and improving the effectiveness of the collections.},

keywords = {Controlled Terms, controlled vocabularies, Dendrogram, Dublin core, harvesting, Language, Linked Open Data, Metadata, OAI-PMH, Repeated Values},

pubstate = {published},

tppubtype = {conference}

}

@conference{Kapidakis2019,

title = {Correcting and redesigning metadata for the excavation of an archaeological site},

author = {Kapidakis, S.},

url = {https://www.springerprofessional.de/correcting-and-redesigning-metadata-for-the-excavation-of-an-arc/17154036},

year  = {2019},

date = {2019-09-12},

booktitle = {23rd  International Conference on Theory and Practice of Digital Libraries, TPDL 2019},

publisher = {LNCS 11799, Springer},

abstract = {Libraries have a long tradition on cataloging with consistency. Other domains try to follow their paradigm, but there are many challenges to be addressed. In this paper we examine the metadata design and implementation for the excavation of an archaeological site. We start by discussing with the excavation personnel, to understand the procedures and the metadata involved. We examine the current metadata scheme and the way it was used to fill in all metadata element values and we classify the obvious errors found in them. We reveal additional required functionality and propose an improved scheme. In the poster we expose our methodology and findings.},

keywords = {Metadata},

pubstate = {published},

tppubtype = {conference}

}

@conference{Kapidakis2018b,

title = {Metadata Synthesis and Updates on Collections Harvested using the Open Archive Initiative Protocol for Metadata Harvesting},

author = {Kapidakis, S.},

url = {https://www.springerprofessional.de/en/metadata-synthesis-and-updates-on-collections-harvested-using-th/16097186},

issn = {0302-9743},

year  = {2018},

date = {2018-09-14},

booktitle = {International Conference on Theory and Practice of Digital Libraries, TPDL 2018},

pages = {16-31},

publisher = {LNCS 10450, Springer},

abstract = {Harvesting tasks gather information to a central repository. We studied the metadata returned from 744179 harvesting tasks from 2120 harvesting services in 529 harvesting rounds during a period of two years. To achieve that, we initiated nearly 1,500,000 tasks, because a significant part of the Open Archive Initiative harvesting services never worked or have ceased working while many other services fail occasionally. We studied the synthesis (elements and verbosity of values) of the harvested metadata, and how it evolved over time. We found that most services utilize almost all Dublin Core elements, but there are services with minimal descriptions. Most services have very minimal updates and, overall, the harvested metadata is slowly improving over time with “description” and “relation” improving the most. Our results help us to better understand how and when the metadata are improved and have more realistic expectations about the quality of the metadata when we design harvesting or information systems that rely on them.},

keywords = {digital libraries, harvesting, Metadata, open archive},

pubstate = {published},

tppubtype = {conference}

}

@conference{Kapidakis2018c,

title = {Unexpected Errors from Metadata OAI-PMH Providers},

author = {Kapidakis, S.},

url = {http://78.46.229.148/ojs/index.php/qqml/article/view/468},

issn = {2241-1925},

year  = {2018},

date = {2018-01-18},

booktitle = {Qualitative and Quantitative Methods in Libraries (QQML)},

volume = {7},

number = {2},

abstract = {We study the behavior and the failure reason of metadata harvesting services. We used existing OAI services and we created our own OAI client to issue requests to them for many harvesting rounds, collecting the appropriate information. We studied 1407537 harvesting tasks from 3446 harvesting services in 552 harvesting rounds during a period of 2 years, of which 618812 (44%) failed and the remaining tasks occasionally returning fewer records. We examined the reported outcome messages, the number of records returned and the response time to discover failing patterns. While most messages indicate temporary errors, we revealed messages with specific details that indicate permanent affect or no effect to the returned metadata records.},

keywords = {error analysis, Metadata, oia-pmh},

pubstate = {published},

tppubtype = {conference}

}