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Linked Data is about using the Web to connect related data that wasn't previously linked, or using the Web to lower the barriers to linking data currently linked using other methods. It leverages fundamental characteristics of Web architecture (loose coupling, decentralization, simple and well defined access patterns) and builds on RDF (a W3C standard data model). We'll give a brief overview of RDF and show how Linked Data principles decouple its use for interoperability and data modelling from the "heavyweight" Semantic Web baggage that has long been considered a barrier to entry.
The characteristics that allowed the Web to scale so quickly and widely include decentralization, a massively distributed architecture, an absence of integrity constraints, and weak guarantees about consistency. The Web of data aims to achieve the same end for data, promoting it to a first class Web citizen and making linking data as easy and ubiquitous as linking HTML documents. Many of the same characteristics that make the Web so successful and scalable also apply to the Web of Data.
The rise of NoSQL databases is a response to the changing requirements of Web scale data. Typically these databases deliver performance at scale by relaxing consistency guarantees, eschewing transactions, using flexible data models and distributed architectures, and placing constraints on access patterns. Linked Data and RDF turn the Web itself into a decentralized and massively scalable sparse column store with globally identifiable column names; an enormous, globally distributed repository of linked, structured data.
In this talk we will highlight the common characteristics of various flavors of NoSQL database and the Web of Data. We will also discuss important differences, and outline the trade-offs involved when deciding on a storage solution for your application data, such as the importance of query performance, availability or ACID transactions. We will be delving into concerns around:
Common query languages
Tool chain interoperability