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neo4j_fdw The view that neo4j_fdw assumes graph database neo4j a source of information contribute it via the interface of the foreign table wrapper of PostgreSQL. In addition, I hand URL and Cypher query with an argument and offer a function to receive a result in JSON. In CREATE SERVER, I set a connection URL to Neo4j. Set Cypher query offering in column and Neo4j which I want to return in CREATE FOREIGN TABLE. It is necessary to match the RETURN phrase of the Cypher query with the column which I want to return. This module needs the following libraries. Please install it beforehand. * libcurl http://curl.haxx.se/libcurl/ * json-c http://oss.metaparadigm.com/json-c/ How to use please refer to a test folder. (after loading data.xml in the data folder.)