We survey foundational features underlying modern graph query languages. We first
discuss two popular graph data models: edge-labelled graphs, where nodes are connected …

Abstract Information systems have to deal with an increasing amount of data that is
heterogeneous, unstructured, or incomplete. In order to align and complete data, systems …

Graph databases have gained renewed interest in the last years, due to its applications in
areas such as the Semantic Web and Social Networks Analysis. We study the problem of …

Despite the fact that JSON is currently one of the most popular formats for exchanging data
on the Web, there are very few studies on this topic and there is no agreement upon a …

Despite the fact that JSON is currently one of the most popular formats for exchanging data
on the Web, there are very few studies on this topic and there is no agreement upon a …

Recent years have seen an increasing interest in ontology-mediated query answering, in
which the semantic knowledge provided by an ontology is exploited when querying data …

For many problems arising in the setting of graph querying (such as finding semantic
associations in RDF graphs, exact and approximate pattern matching, sequence alignment …

Graph databases have received much attention as of late due to numerous applications in
which data is naturally viewed as a graph; these include social networks, RDF and the …

Graph databases are currently one of the most popular paradigms for storing data. One of
the key conceptual differences between graph and relational databases is the focus on …

XPath plays a prominent role as an XML navigational language due to several factors,
including its ability to express queries of interest, its close connection to yardstick database …