def load_rel(self, reltype, target, rId, is_external=False):
        return self.rels.add_relationship(reltype, target, rId, is_external)
OS-specific conversion from a file system path to a relative URL
dataset/ETHPy150Open scanny/python-pptx/pptx/opc/package.py/Part.load_rel--crossover with--dataset/ETHPy150Open ofermend/medicare-demo/socialite/jython/Lib/urllib.py/pathname2url