some information about difflib and dblink with geonames.

README.md

@@ -15,16 +15,43 @@ Clone or download this git repo, then
 
 pip3 install -r requirements.txt
 
+Also, the lib difflib for python with npm: 
+`npm install difflib`
+
+
+At database level, the SGBD must have a base geonames. And you should provide a link through a materialized view with, and grant access to api_user for that.
+
+```sql
+create extension dblink;
+
+drop  view ports.myremote_geonamesplaces;
+create materialized VIEW ports.myremote_geonamesplaces AS
+  SELECT *
+    FROM dblink('dbname=geonames port=5433 user=postgres password=postgres options=-csearch_path=',
+                'select geonameid::int, name, (feature_class||''.''||feature_code) as feature_code, alternatenames, country_code,  latitude::float, longitude::float , point3857
+					from geonames.geonames_nov2019.allcountries a 
+					where feature_class||''.''||feature_code in (select code from geonames.geonames_nov2019.feature_code where keep = ''x'')')
+    AS t1(geonameid int, name text, feature_code text, alternatenames text , country_code text, latitude float, longitude float, point3857 geometry);
+--- 34 s, 5 012 322 lignes
+-- 37 s, 5 012 322 lignes
+
+grant select on  ports.myremote_geonamesplaces to api_user;
+grant select on  ports.matching_port to api_user;
+grant select on  ports.limites_amirautes to api_user;
+```
+
 ### 1.1.1. Running without Apache
 
 python porticgaz.py
 
 (or create a virtualenv, then activate it and pip install -r requirements && python apidata.py)
 
-Backend is running and serve the data on http://localhost:5004 (change the PORT variable in config.py)
+Backend is running and serve the data on http://localhost:80 (change the PORT variable at the top level of porticgaz.py)
 
 ### 1.1.2. Running with Apache
 
+The gazetteer is served by Apache2 running WSGI module.
+
 ```bash
 
 cd /home/plumegeo/navigo/Viz/gazetteer
@@ -116,8 +143,9 @@ You can go on http://explorex.portic.fr to find the UHGS id of a port present in
 ### 1.2.4. fielnames
 
     Récupère des métadonnées sur l'API, avec la liste des attributs, avec leur nom court et long, leur type et leur signification. 
-    get metadata about the gazetteer with short and long name, type and definition
-    Api 'ports' by default.
+    Get metadata about the gazetteer with short and long name, type and definition
+    
+    Api is 'ports' by default.
 
     http://127.0.0.1:80/fieldnames/?format=json
     http://127.0.0.1/fieldnames/?format=json&shortenfields=true