An Extensible Data Enrichment Scheme for Providing Intelligent Services in Internet of Things Environments

Table 2

Terms that are used in the extensible data enrichment and context information levels.

Symbol	Name	Description
s	Subject	A vocabulary for representing the thing to be perceived
p	Predicate	A vocabulary for the relationship between s and o
o	Object	A vocabulary for representing the state or description of s
T	Triplet	A combination of s, p, and o in the form of < s, p, o >
G	Group	A set or union of triplet T
V	Vocabulary	String literals that can be chosen from the ThingsMetadata description
U	URIs	A set of uniform resource identifiers
B	Blank nodes	A node in RDF graphs representing an anonymous resource
L	Literals	A string or a numerical sequence of letters or digits
F(X)	Function for domain X	A function that defines how to process data enrichment
X	Domain X	A set of input data for data enrichment functions