Table 1.

Graph indexing systems

System	Features	Data mining	All matches
GraphGrep	Path	No	Yes
gIndex	Graphs	Yes	No
FGIndex [2]	Graphs	Yes	No
GDIndex [3]	Graphs	No	Yes
TreePi [8]	Tree	Yes	No
Tree+δ [9]	Tree+graphs	Yes	No
CTree	-	No	No
GCoding	-	No	Yes
SING	Path	No	Yes

Review of the main graph indexing systems.