Bug 126414 [Commands] handlers: Provide help context ids
For commands and handlers to replace actions, they need to be capable of providing help context identifiers. For an example, see OpenResourceHandler in org.eclipse.ui.ide. This help context id will need to be definable through XML and through code.
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/CommandManager.java
final String serializedParameterizedCommand)
			throws NotDefinedException, SerializationException {
		final int lparenPosition = unescapedIndexOf(
				serializedParameterizedCommand, PARAMETER_START_CHAR);
		final String commandIdEscaped;
		final String serializedParameters;
		if (lparenPosition == -1) {
			commandIdEscaped = serializedParameterizedCommand;
			serializedParameters = null;
		} else {
			commandIdEscaped = serializedParameterizedCommand.substring(0,
					lparenPosition);
			if (serializedParameterizedCommand
					.charAt(serializedParameterizedCommand.length() - 1) != PARAMETER_END_CHAR) {
				throw new SerializationException(
						"Parentheses must be balanced in serialized ParameterizedCommand"); 
			}
			serializedParameters = serializedParameterizedCommand.substring(
					lparenPosition + 1, 
					serializedParameterizedCommand.length() - 1); 
			
		}
		final String commandId = unescape(commandIdEscaped);
		final Command command = getCommand(commandId);
		final IParameter[] parameters = command.getParameters();
		final Parameterization[] parameterizations = getParameterizations(
				serializedParameters, parameters);
		return new ParameterizedCommand(command, parameterizations);
	}
	/**