Browsing Βιβλιοθηκονομία και Επιστήμη της Πληροφόρησης / Library and Information Science by Author "Γεργατσούλης, Μανώλης"
Now showing items 21-40 of 40
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Path-based MXML Storage and Querying
(2012) -
Query containment under bag and bag-set semantics
(2010)Conjunctive queries (CQs) are at the core of query languages encountered in many logic-based research fields such as AI, or database systems. The majority of existing work assumes set semantics but often in real applications ... -
Query Transformation in a CIDOC CRM Based Cultural Metadata Integration Environment
(2010)The wide use of a number of cultural heritage metadata schemas imposes the development of new interoperability techniques that facilitate unified access to cultural resources. In this paper, we focus on the ontology based ... -
Representing and querying histories of semistructured databases using multidimensional OEM
(2004)Multidimensional semistructured data (MSSD) are semistructured data that present different facets under different contexts. Context represents alternative worlds, and is expressed by assigning values to a set of user-defined ... -
Representing changes in XML documents using dimensions
(2003)In this paper, we present a method for representing the history of XML documents using Multidimensional XML (MXML). We demonstrate how a set of basic change operations on XML documents can be represented in MXML, and show ... -
Representing time-dependent information in multidimensional XML
(2001)Multidimensional XML (MXML) is an extension of XML that incorporates dimensions in order to represent in an elegant and concise way context-dependent data, that is, data which can exhibit different variations in value or ... -
A semantic mapping of VRA Core 4.0 to the CIDOC conceptual reference model
(2011)In the recent decades, we have witnessed a tremendous proliferation of metadata schemas, particularly in the cultural heritage domain. As a consequence, there is a growing need to integrate these schemas to solve a number ... -
Storing multidimensional XML documents in relational databases
(2007)The problem of storing and querying XML data using relational databases has been considered a lot and many techniques have been developed. MXML is an extension of XML suitable for representing data that assume different ... -
Temporal disjunctive logic programming
(2001)In this paper we introduce the logic programming language Disjunctive Chronolog which combines the programming paradigms of temporal and disjunctive logic programming. Disjunctive Chronolog is capable of expressing dynamic ... -
Temporal stratification tests for linear and branching-time deductive databases
(2005)We consider the problem of extending temporal deductive databases with stratified negation. We argue that the classical stratification test for deductive databases is too restrictive when one shifts attention to the temporal ... -
A transformation technique for datalog programs based on non-deterministic constructs
(2001)Recently, a novel transformation technique for Datalog programs, called the branching-time transformation, was introduced by the authors. In this paper we propose a significant extension of the branching-time transformation ... -
Unfold/fold transformations for disjunctive logic programs
(1997)Unfold/fold transformation rules for disjunctive logic programs are proposed in this paper. Our transformation rules preserve the meaning of the programs. -
Union rewritings for XPath fragments
(2011)In this paper, we study the problem of finding an equivalent rewriting of an XPath query using multiple views, and we show that the union operator may be required in order to find such a rewriting. In particular, focusing ... -
Updating multidimensional XML documents
(2008)Purpose-In a wide spectrum of applications, it is desirable to manipulate semistructured information that may present variations according to different circumstances. Multidimensional XML (MXML) is an extension of XML ... -
A value-propagating transformation technique for Datalog programs based on non-deterministic constructs
(2006)The branching-time transformation is a recent technique for optimizing Chain Datalog programs. In this paper we propose a significant extension of the branching-time transformation which we believe opens up a promising new ... -
View selection for real conjunctive queries
(2007)Given a query workload, a database and a set of constraints, the view-selection problem is to select views to materialize so that the constraints are satisfied and the views can be used to compute the queries in the workload ... -
Αναπαράσταση και διαχείριση χρονικά εξαρτώμενης πληροφορίας στις πολιτιστικές συλλογές
(Βιβλιοθήκη Πανεπιστημίου Κύπρου, 2005)Ο χρόνος αποτελεί μια ουσιώδη παράμετρο για τη διαχείριση και την οργάνωση πολιτιστικών συλλογών. Αυτό οφείλεται στο γεγονός ότι η παράμετρος του χρόνου επηρεάζει σημαντικά δυο κύρια χαρακτηριστικά μιας λαογραφικής συλλογής, ... -
Διαλειτουργικότητα σχημάτων μεταδεδομένων: μία προσέγγιση με τη χρήση της οντολογίας CIDOC CRM
(Ιόνιο Πανεπιστήμιο, Τμήμα Αρχειονομίας – Βιβλιοθηκονομίας, 2012)Η παρούσα διδακτορική διατριβή ασχολείται με τη μελέτη και ανάπτυξη τεχνικών δια- λειτουργικότητας σχημάτων μεταδεδομένων, η οποία αποτελεί ένα ενεργό ερευνητικό πρό¬βλημα στο χώρο της διαχείρισης της πληροφορίας. Στο ... -
Διαχείριση οντολογιών: μελέτη και εμβάθυνση στα βασικά προβλήματα που την αφορούν και παρουσίαση υπαρχουσών βιβλιοθηκών οντολογιών
(Πανεπιστήμιο Πατρών, 2006)Τα τελευταία χρόνια καταβάλλεται σημαντική προσπάθεια στην κατεύθυνση της ανάπτυξης τεχνικών οι οποίες στοχεύουν στον “Σημασιολογικό Ιστό”. Ο στόχος στην κατεύθυνση αυτή είναι να δοθεί η δυνατότητα στα προγράμματα των Η/Υ ... -
Σημασιολογική Ολοκλήρωση Δεδομένων με τη χρήση Οντολογιών
(Πανεπιστήμιο Πατρών; Βιβλιοθήκη Πανεπιστημίου Κύπρου, 2006)Η δημιουργία και η ταχεία εξέλιξη του Διαδικτύου οδήγησε στη διάθεση ποικίλλων δεδομένων και στην παροχή πρόσβασης σε μεγάλο αριθμό χρηστών. Ανάλογη με την εξέλιξη του Διαδικτύου είναι και η αύξηση του περιεχομένου που ...
