parseRelation: Parse RELATION elements from KGML files
Description
RELATION elements in KGML files record the binary relationships
between ENTRY elements, corresponding to (directed) edges in a
graph. 'parseRelation' function parses RELATION elements into
KEGGEdge-class
objects from KGML
files. It is not expected to be called directly by the user.
Usage
parseRelation(relation)
Arguments
relation
XML node of KGML file
Value
An object of link{KEGGEdge}
.