001/** 002 * Logback: the reliable, generic, fast and flexible logging framework. 003 * Copyright (C) 1999-2022, QOS.ch. All rights reserved. 004 * 005 * This program and the accompanying materials are dual-licensed under 006 * either the terms of the Eclipse Public License v1.0 as published by 007 * the Eclipse Foundation 008 * 009 * or (per the licensee's choosing) 010 * 011 * under the terms of the GNU Lesser General Public License version 2.1 012 * as published by the Free Software Foundation. 013 */ 014package ch.qos.logback.core.model; 015 016import ch.qos.logback.core.CoreConstants; 017 018public class ModelConstants { 019 020 021 public static final String DEBUG_SYSTEM_PROPERTY_KEY = "logback.debug"; 022 public static final String NULL_STR = CoreConstants.NULL_STR; 023 024 public static final String INVALID_ATTRIBUTES = "In <property> element, either the \"file\" attribute alone, or " 025 + "the \"resource\" element alone, or both the \"name\" and \"value\" attributes must be set."; 026 027 public static final String PARENT_PROPPERTY_KEY = "parent"; 028}