Github user leifurhauks commented on the issue:
https://github.com/apache/tinkerpop/pull/340
> This is just for the GeoPoint-style adding classes?
More generally, it can be used to create expressions that make use of APIs,
presumably provided by the graph vendor, that aren't strictly part of gremlin.
My immediate use case is to call static methods on Titan's Geoshape class.
I'll add an example to the asciidoc.
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