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Chapter and Conference Paper
ReLOG: A Unified Framework for Relationship-Based Access Control over Graph Databases
Relationship-Based Access Control (ReBAC) is a paradigm to specify access constraints in terms of interpersonal relationships. To express these graph-like constraints, a variety of ReBAC models with varying fe...
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Article
Open AccessCompetition-driven modeling of temporal networks
We study the problem of modeling temporal networks constrained by the size of a concurrent set, a characteristic of temporal networks shown to be important in many application areas, e.g., in transportation, s...
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Chapter
Data Models
In this chapter, we introduce the property graph model. The property graph model is important for graph-based data management as it is implemented in many systems and used as a reference model for various rese...
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Chapter
Introduction
Graph data management systems have experienced a renaissance in recent years. The reason for this is clear: with a confluence of trends in society, science, and technology, graph-structured data sets are incre...
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Chapter
Query Languages
In this chapter we give a presentation of property graph query languages. We begin with the core language functionalities of graph navigation queries and (unions of) conjunctions of navigational queries. Our a...
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Chapter
Query Processing
The diversity of applications in which graphs are used as primary data models led to a proliferation of a variety of graph processing tasks. For example, in social networks, one might be interested in looking ...
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Chapter
Research Challenges
Throughout the book we have highlighted open research challenges. In this final chapter we collect and consolidate these challenges, providing an overview of what we see as important open problems for the grap...
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Chapter
Constraints
Graph-shaped data differs from structured data mainly because of the lack of an underlying schema and metadata. Graph datasets typically blend values with metadata information without a clear distinction among...
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Chapter
Data Structures and Indexes
A property graph is a complex structure requiring some care to be represented in the linear memory model1 of computers. A memory representation for property graphs should be: (1) concise, i.e., represent a given ...
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Chapter
Physical Operators
This chapter discusses how graph-centric features used in the graph query languages of Chapter 3 introduce new challenges in physical query evaluation. We focus particularly on the design and implementation of...
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Chapter
Query Specification
We describe in this chapter graph query specification techniques to help users formulate path queries from examples provided as input or via graph exploration. This problem amounts to learning queries from exa...
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Book
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Chapter and Conference Paper
From MDM to DB2: A Case Study of Security Enforcement Migration
This work presents a case study of a migration of attribute-based access control enforcement from the application to the database tier. The proposed migration aims to improve the security and simplify the audi...
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Chapter and Conference Paper
Towards Automatic Acquisition of a Fully Sense Tagged Corpus for Persian
Sense tagged corpora play a crucial role in Natural Language Processing, particularly in Word Sense Disambiguation and Natural Language Understanding. Since semantic annotations are usually performed by humans...
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Chapter and Conference Paper
Cross-Lingual Word Sense Disambiguation for Languages with Scarce Resources
Word Sense Disambiguation has long been a central problem in computational linguistics. Word Sense Disambiguation is the ability to identify the meaning of words in context in a computational manner. Statistic...
