* <groupId>:<artifactId>:<version>} but some of these coordinates may still be unknown at the point the exception
     * is thrown so this information is merely meant to assist the user.
     *
     * @return The identifier of the project or an empty string if not known, never {@code null}.
     */
    String getProjectId();

    /**
     * Gets the POM file from which the project was built.

    }

    @Test
    @DisplayName("Unknown DOS error code yields empty Optional")
    void testUnknownCode() {
        Optional<Integer> noMatch = findNtStatus(0xdeadbeef);
        assertFalse(noMatch.isPresent(), "Mapping for unknown code should be absent");
    }

    @Test
    @DisplayName("Mocked consumer receives correct NTSTATUS value")

                true), SERVICE_UNAVAILABLE("Service temporarily unavailable", ErrorCategory.TRANSIENT, true),

        // Generic errors
        UNKNOWN_ERROR("Unknown error", ErrorCategory.UNKNOWN, false), INTERNAL_ERROR("Internal error", ErrorCategory.UNKNOWN, false);

        private final String description;
        private final ErrorCategory category;
        private final boolean retryable;

     *
     * @param message The error message, may be {@code null}.
     * @param lineNumber The one-based index of the line containing the error or {@code -1} if unknown.
     * @param columnNumber The one-based index of the column containing the error or {@code -1} if unknown.
     */
    public MetadataParseException(String message, int lineNumber, int columnNumber) {
        super(message);
        this.lineNumber = lineNumber;

/*
 [Crawler Notification]
*/
subject: [FESS] Status Change: /*pmb.hostname:orElse('Unknown')*/
>>>
--- Server Info ---
Cluster Name: /*pmb.clustername:orElse('Unknown')*/
Host Name: /*pmb.hostname:orElse('Unknown')*/

--- Status ---

     */
    public String getId() {
        return (getGroupId() == null ? "[unknown-group-id]" : getGroupId())
            + ":" + (getArtifactId() == null ? "[unknown-artifact-id]" : getArtifactId())
            + ":" + (getVersion() == null ? "[unknown-version]" : getVersion());
    }
            ]]>
          </code>
        </codeSegment>
      </codeSegments>
    </class>

     */
    String getSource();

    /**
     * Gets the one-based index of the line containing the problem. The line number should refer to some text file that
     * is given by {@link #getSource()}.
     *
     * @return The one-based index of the line containing the problem or a non-positive value if unknown.
     */
    int getLineNumber();

    /**

    }

    // Edge: unknown service returns null per stub
    @Test
    @DisplayName("getSmbTree unknown service returns null as stubbed")
    void getSmbTree_unknownService() {
        when(session.getSmbTree(eq("share"), eq("UNKNOWN"))).thenReturn(null);
        assertNull(session.getSmbTree("share", "UNKNOWN"));
        verify(session).getSmbTree("share", "UNKNOWN");
    }

            case UNSPECIFIED:
                result.append("Unspecified error");
                break;
            default:
                result.append("Unknown error code: ").append(errorCode);
            }
            break;
        default:
            result.append("unknown error class: ").append(errorClass);
        }
        return result.toString();
    }

    /**

        //this if is a bit cheesy but 1-letter classname surely means a generic type and the warning will be useless
        if (className.length() > 1) {
            listener.warning(String.format("Could not generate link for unknown class '%s'", className));
        }
        Element element = document.createElement("classname");
        element.appendChild(document.createTextNode(className));
        return element;
    }