creating prop semantic_uri to store metadatum schema information

src/classes/entities/class-tainacan-metadatum.php

@@ -210,6 +210,15 @@ class Metadatum extends Entity {
     public function get_exposer_mapping() {
     	return $this->get_mapped_property('exposer_mapping');
     }
+    
+    /**
+     * Return the semantic_uri
+     *
+     * @return string
+     */
+    function get_semantic_uri(){
+        return $this->get_mapped_property('semantic_uri');
+    }
 
     /**
      * Set the metadatum name
@@ -361,7 +370,16 @@ class Metadatum extends Entity {
     public function set_exposer_mapping( $value ) {
     	$this->set_mapped_property('exposer_mapping', $value);
     }
-	
+    
+    /**
+     * Set Semantic URI for the metadatum
+     *
+     * @param [string] $value
+     * @return void
+     */
+    function set_semantic_uri( $value ){
+        $this->set_mapped_property('semantic_uri', $value);
+    }
 	
 	/**
 	 * Transient property used to store the status of the metadatum for a particular collection

src/classes/repositories/class-tainacan-metadata.php

@@ -40,6 +40,10 @@ class Metadata extends Repository {
 
     }
 	
+    /**
+     * {@inheritDoc}
+     * @see \Tainacan\Repositories\Repository::get_map()
+     */
     public function get_map() {
     	return apply_filters('tainacan-get-map-'.$this->get_name(), [
 		    'name'               => [
@@ -182,7 +186,15 @@ class Metadata extends Repository {
 			    'validation'  => v::stringType()->in( [ 'yes', 'no', 'never' ] ),
 			    'description' => __( 'Display by default on listing or do not display or never display.', 'tainacan' ),
 			    'default'     => 'yes'
-		    ]
+		    ],
+    	    'semantic_uri'    => [
+    	        'map'         => 'meta',
+    	        'title'       => __( 'The semantic metadatum description URI' ),
+    	        'type'        => __( 'url' ),
+    	        'validation'  => v::optional(v::url()),
+    	        'description' => __( 'The semantic metadatum description URI like: ', 'tainacan' ).'https://schema.org/URL',
+    	        'default'     => ''
+    	    ]
 	    ] );
     }
 	

src/exposers/class-tainacan-exposers.php

@@ -403,7 +403,7 @@ class Exposers {
 	                   $metadatum->set_metadata_type('Tainacan\Metadata_Types\Text');
 	               }
 	               $metadatum->set_name($mapper_metadatum['label']);
-	               $metadatum->set_description($mapper_metadatum['URI']);
+	               $metadatum->set_semantic_uri($mapper_metadatum['URI']);
 	               $metadatum->set_exposer_mapping([
 	                   $mapper->slug => $slug
 	               ]);