Add an edge for every attribute the given artifact provides.

    This method adds a directed edge from the artifact node to every attribute
    this artifact provides.

    Args:
      rdf_artifact: The artifact object.

def _AddProvidesEdges(self, rdf_artifact):
    """Add an edge for every attribute the given artifact provides.

    This method adds a directed edge from the artifact node to every attribute
    this artifact provides.

    Args:
      rdf_artifact: The artifact object.
    """
    for attribute in rdf_artifact.provides:
      self._AddEdge(rdf_artifact.name, attribute)