code: public void setURL(String url) {
  		try {
  			this.value = (url != null) ? new URL(url) : null;
  		} catch (Throwable exception) {
  			this.value = null;
  		}
  		this.type = AttributeType.URL;
  		this.assigned = this.value != null;
  	}
docs: Set the value of this metadata.
  
  @param url the url.