code: public XML deleteAttributes(Class<?> aClass,String[] attributes){
  		checksAttributesExistence(aClass,attributes);
  		
  		if(isEmpty(findXmlClass(aClass).attributes) || findXmlClass(aClass).attributes.size()<=1)
  			Error.xmlWrongMethod(aClass);
  		
  		for (String attributeName : attributes) {
  			XmlAttribute attribute = null;
  			for (XmlAttribute xmlAttribute : findXmlClass(aClass).attributes)
  				if(xmlAttribute.name.equals(attributeName))
  					attribute = xmlAttribute;
  			
  			if(attribute == null) Error.xmlAttributeInexistent(this.xmlPath,attributeName,aClass);
  				
  			findXmlClass(aClass).attributes.remove(attribute);
  		}
  		return this;
  	}
docs: This method deletes the attributes to an existing Class.
  @param aClass class to which delete the attributes
  @param attributes attributes to delete
  @return this instance of XML