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@@ -318,13 +318,15 @@ SELECT distinct ?country_uri ?named_authority_code ?country_en
     Bind(str(?c_en) as ?country_en)
     filter(lang(?c_en) = "en") 
     
+    # Filtering the territories and the marine areas
     ?country_uri skos:inScheme ?scheme .
 
+    # Filtering out the deprecated and the retired concepts
     filter not exists {?country_uri owl:deprecated ?true}
     filter not exists {
-    ?country_uri euvoc:status <http://publications.europa.eu/resource/authority/concept-status/RETIRED>
-    }
+    ?country_uri euvoc:status <http://publications.europa.eu/resource/authority/concept-status/RETIRED>}
   
+    # Retrieval of the EU official code
     ?country_uri euvoc:xlNotation ?not_authority .
     ?not_authority rdf:value ?named_authority_code .
     ?not_authority dct:type <http://publications.europa.eu/resource/authority/notation-type/NAC> .
@@ -353,39 +355,43 @@ SELECT ?country_uri ?named_authority_code ?country_en ?ISO_31661_alpha2
   
   WHERE {    
 
+    # Retrieving the current countries and their english preferred labels
     ?country_uri a skos:Concept .
     ?country_uri skos:inScheme <http://publications.europa.eu/resource/authority/country/0001> .
     ?country_uri skos:prefLabel ?c_label_en .
     Bind(str(?c_label_en) as ?country_en) .
     filter(lang(?c_label_en) = "en")
     
+    # Retrieval of the EU official code
     ?country_uri euvoc:xlNotation ?not_authority .
     ?not_authority rdf:value ?named_authority_code .
     ?not_authority dct:type <http://publications.europa.eu/resource/authority/notation-type/NAC> .
     
+    # Retrieving the 2 alpha ISO codes (if available)
     optional {
     ?country_uri euvoc:xlNotation ?not_alpha2 .
     ?not_alpha2 rdf:value ?ISO_31661_alpha2 .
     ?not_alpha2 dct:type <http://publications.europa.eu/resource/authority/notation-type/ISO_3166_1_ALPHA_2> .
     }
 
+    # Retrieving the 3 alpha ISO codes (if available)
     optional {
     ?country_uri euvoc:xlNotation ?not_alpha3 .
     ?not_alpha3 rdf:value ?ISO_31661_alpha3 .
     ?not_alpha3 dct:type <http://publications.europa.eu/resource/authority/notation-type/ISO_3166_1_ALPHA_3> .
     }
     
+    # Retrieving the numerical ISO codes (if available)
     optional {
     ?country_uri euvoc:xlNotation ?not_num .
     ?not_num rdf:value ?ISO_31661_num .
     ?not_num dct:type <http://publications.europa.eu/resource/authority/notation-type/ISO_3166_1_NUM> .
     }
+
+    # Filtering out the deprecated and the retired concepts
+    filter not exists {?country_uri owl:deprecated ?dep}
     filter not exists {
-    ?country_uri owl:deprecated ?dep
-    }
-    filter not exists {
-    ?country_uri euvoc:status <http://publications.europa.eu/resource/authority/concept-status/RETIRED>
-    }
+    ?country_uri euvoc:status <http://publications.europa.eu/resource/authority/concept-status/RETIRED>}
 } 
 ```
 
@@ -407,40 +413,42 @@ SELECT ?country_uri ?named_authority_code ?country_en ?ISO_31661_alpha2
        ?ISO_31661_alpha3 ?ISO_31661_num   
 
     WHERE {    
-    
+    # Retrieving the current countries, territories and marine areas, and their english preferred labels
     ?country_uri a skos:Concept .
     ?country_uri skos:prefLabel ?c_label_en .
     Bind(str(?c_label_en) as ?country_en) .
     filter(lang(?c_label_en) = "en")
     
+    # Retrieval of the EU official code
     ?country_uri euvoc:xlNotation ?not_authority .
     ?not_authority rdf:value ?named_authority_code .
     ?not_authority dct:type <http://publications.europa.eu/resource/authority/notation-type/NAC> .
     
-    
+    # Retrieving the 2 alpha ISO codes (if available)
     optional {
     ?country_uri euvoc:xlNotation ?not_alpha2 .
     ?not_alpha2 rdf:value ?ISO_31661_alpha2 .
     ?not_alpha2 dct:type <http://publications.europa.eu/resource/authority/notation-type/ISO_3166_1_ALPHA_2> .
     }
     
+   # Retrieving the 3 alpha ISO codes (if available)
     optional {
     ?country_uri euvoc:xlNotation ?not_alpha3 .
     ?not_alpha3 rdf:value ?ISO_31661_alpha3 .
     ?not_alpha3 dct:type <http://publications.europa.eu/resource/authority/notation-type/ISO_3166_1_ALPHA_3> .
     }
     
+    # Retrieving the numerical ISO codes (if available)
     optional {
     ?country_uri euvoc:xlNotation ?not_num .
     ?not_num rdf:value ?ISO_31661_num .
     ?not_num dct:type <http://publications.europa.eu/resource/authority/notation-type/ISO_3166_1_NUM> .
     }
+
+    # Filtering out the deprecated and the retired concepts
+    filter not exists {?country_uri owl:deprecated ?dep}
     filter not exists {
-    ?country_uri owl:deprecated ?dep
-    }
-    filter not exists {
-    ?country_uri euvoc:status <http://publications.europa.eu/resource/authority/concept-status/RETIRED>
-    }
+    ?country_uri euvoc:status <http://publications.europa.eu/resource/authority/concept-status/RETIRED>}
 } 
 ```
 ####     4\.9 Current EU member states, their official code, their preferred labels in english and their ISO codes: