techno.md

@@ -37,6 +37,7 @@
 See also:
  * *[What are the pros and cons of RDB2RDF tools?]* on Stack Overflow
  * *[converter2rdf]* on the W3C wiki
+ * *[Graph DataBase]* on Wikipedia
 
 ### Web Server
   * [Apache HTTP Server]
@@ -96,6 +97,7 @@ See also:
 [marklogic]:http://www.marklogic.com/
 [What are the pros and cons of RDB2RDF tools?]:https://stackoverflow.com/questions/45476632/what-are-the-pros-and-cons-of-rdb2rdf-tools
 [converter2rdf]:https://www.w3.org/wiki/ConverterToRdf#SQL
+[graph database]:https://en.wikipedia.org/wiki/Graph_database
 [nodejs]:https://nodejs.org/en/
 [mongodb]:https://www.mongodb.com/
 [django]:https://www.djangoproject.com/