. Author manuscript; available in PMC: 2015 Apr 11.

Published in final edited form as: Proc Int World Wide Web Conf. 2014 Apr 11;2014:759–770. doi: 10.1145/2566486.2567973

Table 1.

Sample queries for different types of meta knowledge, each query example is assigned an identifier (P, T, S, and C) for references

Query type	Examples
Provenance	P1. Where is this fact from?
	P2. When was it created?
	P3. Who created this fact?

Temporal	T1. When did this event occur?
	T2. What is the time span of this event?
	T3. Which events were in the same year?

Spatial	S1. What is the location of this event?
	S2. Which events were at the same place?

Certainty	C1. What is the confidence of this fact?