docs: public static String contextAsString(final Set<Attribute> context) {
          StringBuilder sb = new StringBuilder();
          for (Attribute attribute : context) {
              if(sb.length()<1) {
                  sb.append("{");
              }else {
                  sb.append(", ");
              }
              sb.append(Attribute.propertyKeyForURIBase(attribute, EnvironmentalContext.URI_BASE))
                .append("=")
                .append(attribute.getValue())
                ;
          }
          sb.append("}");
          return sb.toString();
      }