221Geoinformatics and Social Media
of several primary building blocks, namely, entry, geolocation, time, keywords,
and authors. As some of these components may have many-to-many relationships
between them, additional tables were added to represents such relationships. In the
following discussion, we describe these components and the relations between them:
• Entry: An information entry serves as an abstract record of social media
data, a high-level entity that binds the various components that constitute
a data entry. An entry instance is uniquely identied and is linked to one
author instance of the author component. In addition, each entry is asso-
ciated with a time stamp indicating when was the entry instance was
published.
• Source API ...