  Recently, a variety of database implementations adopting the property graph
model have emerged. However, interoperable management of graph data on these
implementations is challenging due to the differences in data models and
formats. Here, we redefine the property graph model incorporating the
differences in the existing models and propose interoperable serialization
formats for property graphs. The model is independent of specific
implementations and provides a basis of interoperable management of property
graph data. The proposed serialization is not only general but also intuitive,
thus it is useful for creating and maintaining graph data. To demonstrate the
practical use of our model and serialization, we implemented converters from
our serialization into existing formats, which can then be loaded into various
graph databases. This work provides a basis of an interoperable platform for
creating, exchanging, and utilizing property graph data.
