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Thoughts on linked data, data integration and information management.

Exploring reification syntax in RDF 1.2 Turtle

RDF 1.2 Turtle introduces several syntactic improvements intended to make data modeling more expressive and concise. One of the most notable enhancements is the …

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Why I'm concerned about RDF-Star

In a recent post, Dean Allemang explained why he’s not excited about RDF-star. In this post I want to expand on Dean’s post with more concrete …

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Connecting to Amazon Neptune using curl and SPARQL with Signature Version 4 Signing

This post shows how to connect to Amazon Neptune using curl with Signature Version 4 authentication. For more information about AWS Identity and Access …

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Append data to the URL query for SPARQL requests with curl

Although this post uses Dydra graph database cloud service to illustrate the concepts, the approach is equally applicable to any RDF graph store that supports …

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Notes on SPARQL aggregates

Aggregates functions like SUM, MIN, MAX, AVG and GROUP_CONCAT provide an easy way to aggregate over a complete dataset, or groups within a dataset in …

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