diff --git a/src/app/mapping/mapping.component.html b/src/app/mapping/mapping.component.html
index dce44397cdb17e81c739b41529cd56199aa4ebb0..2a4359bbc27fbb7a443e31cb3a5a5fdff27b172a 100644
--- a/src/app/mapping/mapping.component.html
+++ b/src/app/mapping/mapping.component.html
@@ -63,6 +63,7 @@
                                         </nb-autocomplete>
                                     </nb-form-field>
                                 </div>
+                                
                             </div>
                         </nb-form-field>
                     </ng-container>
diff --git a/src/app/mapping/mapping.component.scss b/src/app/mapping/mapping.component.scss
index 289b1adb30bc1c8f8318a28430e4f59d1f7a397b..1227abfb2cd766e841e916aff1ec4e89d4e6fd38 100644
--- a/src/app/mapping/mapping.component.scss
+++ b/src/app/mapping/mapping.component.scss
@@ -17,31 +17,7 @@
     margin: 0 0.5rem;
   }
 
-  .col-5 {
-    width: 45%;
-    vertical-align: middle;
-    margin-right: 10px;
-    align-items: stretch;
-  }
-  .col-2 {
-    width: 10%;
-    vertical-align: middle;
-    margin-right: 10px;
-    align-items: stretch;
-  }
-  .col-4 {
-    width: 30%;
-    
-    margin-right: 10px;
-    align-items: stretch;
-  }
-
-  .col-8 {
-    width: 70%;
-    
-    margin: 10 0.5rem;
-    align-items: stretch;
-  }
+ 
   input {
     margin: 10px 10px;
     
diff --git a/src/app/mapping/mapping.component.ts b/src/app/mapping/mapping.component.ts
index b869d925c24b3f3f602e7aaadcd0c104d18fedff..0cc4c1ca3e4042aa15b945e0af4dbd68cfa33629 100644
--- a/src/app/mapping/mapping.component.ts
+++ b/src/app/mapping/mapping.component.ts
@@ -110,6 +110,12 @@ export class MappingComponent implements OnInit {
           case 'dct:language':
             properties += key + ' <' + value + '>;\n';
             break;
+          case 'dct:issued':
+            properties += key + ' "' + value + '"^^xsd:dateTime;\n';
+            break;
+          case 'dct:modified':
+            properties += key + ' "' + value + '"^^xsd:dateTime;\n';
+            break;  
           default:
             properties += key + ' "' + value + '";\n';
             break;
@@ -118,6 +124,7 @@ export class MappingComponent implements OnInit {
 
       data = '\@prefix dcat: <http://www.w3.org/ns/dcat#>.\n\
                @prefix dct: <http://purl.org/dc/terms/>.\n\
+               @prefix adms: <http://www.w3.org/ns/adms#> .\n\
                @prefix language: <http://id.loc.gov/vocabulary/iso639-1/>.\n\
                @prefix s: <'+ this.FDP_URL + '/>.\n\
                @prefix c: <'+ this.FDP_URL + '/catalog/>.\n\
@@ -347,6 +354,10 @@ export class MappingComponent implements OnInit {
     }
     reader.readAsText(jsonFile);
   }
+
+  addField(index: number) {
+    
+  }
   // to delete a property of dcat dataset mapped
   deleteProperty(key: string) {
     this.mappedMetadatas[this.index].delete(key);
diff --git a/src/assets/dataset.json b/src/assets/dataset.json
index 6e2a19289d2f2d2f9b165dcee01de9a503eef661..ce2018555e94b4324e1cf756762542ee302bd448 100644
--- a/src/assets/dataset.json
+++ b/src/assets/dataset.json
@@ -77,7 +77,7 @@
   {
     "name": "other identifier",
     "identifier": "adms:identifier",
-    "usageNote": "Optional property. This property contains the date of formal issuance (e.g., publication) of the Dataset."
+    "usageNote": "Optional property. This property refers to a secondary identifier of the Dataset, such as MAST/ADS[1], DataCite[2], DOI[3], EZID[4] or W3ID[5]."
   },
   {
     "name": "release date datele",
diff --git a/src/styles.scss b/src/styles.scss
index a931d951bfd8e264ed758b75c1731e45013d27b4..5efd1a01aadf7dec8161b1ce3efc1bc5b1558f29 100644
--- a/src/styles.scss
+++ b/src/styles.scss
@@ -72,6 +72,79 @@ textarea {
   padding-left: .4em;
 }
 
+.col-1 {
+  flex: 0 0 auto;
+  width: 8.33333333%;
+  margin-right: 10px;
+}
+
+.col-2 {
+  flex: 0 0 auto;
+  width: 16.66666667%;
+  margin-right: 10px;
+}
+
+.col-3 {
+  flex: 0 0 auto;
+  width: 25%;
+  margin-right: 10px;
+
+}
+
+.col-4 {
+  flex: 0 0 auto;
+  width: 33.33333333%;
+  margin-right: 10px;
+}
+
+.col-5 {
+  flex: 0 0 auto;
+  width: 41.66666667%;
+  margin-right: 10px;
+}
+
+.col-6 {
+  flex: 0 0 auto;
+  width: 50%;
+  margin-right: 10px;
+}
+
+.col-7 {
+  flex: 0 0 auto;
+  width: 58.33333333%;
+  margin-right: 10px;
+}
+
+.col-8 {
+  flex: 0 0 auto;
+  width: 66.66666667%;
+  margin-right: 10px;
+}
+
+.col-9 {
+  flex: 0 0 auto;
+  width: 75%;
+  margin-right: 10px;
+}
+
+.col-10 {
+  flex: 0 0 auto;
+  width: 83.33333333%;
+  margin-right: 10px;
+}
+
+.col-11 {
+  flex: 0 0 auto;
+  width: 91.66666667%;
+  margin-right: 10px;
+}
+
+.col-12 {
+  flex: 0 0 auto;
+  width: 100%;
+  margin-right: 10px;
+}
+
 
 /* everywhere else */
 * {