techno.md

@@ -45,6 +45,7 @@ See also:
  * *[RDF and SQL]* on Wikipedia
  * *[converter2rdf]* on the W3C wiki
  * *[Graph DataBase]* on Wikipedia
+ * *[Knowledge Extraction]* on Wikipedia
 
 ### Web Server
   * [Apache HTTP Server]
@@ -110,6 +111,7 @@ See also:
 [RDF and SQL]:https://www.w3.org/wiki/RdfAndSql
 [converter2rdf]:https://www.w3.org/wiki/ConverterToRdf#SQL
 [graph database]:https://en.wikipedia.org/wiki/Graph_database
+[knowledge extraction]:https://en.wikipedia.org/wiki/Knowledge_extraction
 [nodejs]:https://nodejs.org/en/
 [mongodb]:https://www.mongodb.com/
 [django]:https://www.djangoproject.com/