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14 package ch.qos.logback.core.model;
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16 import ch.qos.logback.core.CoreConstants;
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18 public class ModelConstants {
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21 public static final String DEBUG_SYSTEM_PROPERTY_KEY = "logback.debug";
22 public static final String NULL_STR = CoreConstants.NULL_STR;
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24 public static final String INVALID_ATTRIBUTES = "In <property> element, either the \"file\" attribute alone, or "
25 + "the \"resource\" element alone, or both the \"name\" and \"value\" attributes must be set.";
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27 public static final String PARENT_PROPPERTY_KEY = "parent";
28 }