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diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/api/commons/Constants.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/api/commons/Constants.java
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+/**
+ * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
+ * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
+ * joint initiative of the Federal Chancellery Austria and Graz University of
+ * Technology.
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://www.osor.eu/eupl/
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ *
+ * This product combines work with different licenses. See the "NOTICE" text
+ * file for details on the various modules and licenses.
+ * The "NOTICE" text file is part of the distribution. Any derivative works
+ * that you distribute must include a readable copy of the "NOTICE" text file.
+ */
+package at.gv.egiz.pdfas.api.commons;
+
+import at.knowcenter.wag.egov.egiz.pdf.AdobeSignatureHelper;
+
+/**
+ * Contains commonly used constants.
+ * 
+ * @author wprinz
+ */
+public final class Constants
+{
+
+  /**
+   * Hidden default constructor.
+   */
+  private Constants()
+  {
+    // empty
+  }
+
+  /**
+   * A binary signature.
+   * This value should not be modified due to external dependencies!
+   */
+  public static final String SIGNATURE_TYPE_BINARY = "binary";
+
+  /**
+   * A textual signature.
+   * This value should not be modified due to external dependencies!
+   */
+  public static final String SIGNATURE_TYPE_TEXTUAL = "textual";
+  
+  /**
+   * The default signature type (one of "textual", "binary", "detachedtextual").
+   */
+  public static final String DEFAULT_SIGNATURE_TYPE = SIGNATURE_TYPE_BINARY;
+
+  /**
+   * A "detached" textual signature.
+   * 
+   * <p>
+   * The document text is signed, but instead of returning the pdf with the signature block,
+   * the sign result XML of the connector is returned.
+   * </p>
+   */
+  public static final String SIGNATURE_TYPE_DETACHEDTEXTUAL = "detachedtextual";
+
+  /**
+   * The signature device moa.
+   * This value should not be modified due to external dependencies!
+   */
+  public static final String SIGNATURE_DEVICE_MOA = "moa";
+
+  /**
+   * The signature device bku.
+   * This value should not be modified due to external dependencies!
+   */
+  public static final String SIGNATURE_DEVICE_BKU = "bku";
+
+  /**
+   * The signature device a1.
+   * This value should not be modified due to external dependencies!
+   */
+  public static final String SIGNATURE_DEVICE_A1 = "a1";
+
+  /**
+   * The signature device MOCCA (online bku).
+   * This value should not be modified due to external dependencies!
+   */
+  public static final String SIGNATURE_DEVICE_MOC = "moc";
+
+  /**
+   * Added by rpiazzi
+   * The signature device MOBILE.
+   * This value should not be modified due to external dependencies!
+   */
+  public static final String SIGNATURE_DEVICE_MOBILE = "mobile";
+  
+  /**
+   * Added by rpiazzi
+   * The signature device MOBILETEST for the test version of the MOBILE CCS.
+   * This value should not be modified due to external dependencies!
+   */
+  public static final String SIGNATURE_DEVICE_MOBILETEST = "mobiletest";
+  
+  /**
+   * Only binary signatures are verified.
+   */
+  public static final String VERIFY_MODE_BINARY_ONLY = "binaryOnly";
+
+  /**
+   * Binary and textual signatures are verified with time optimization.
+   * 
+   * <p>
+   * This mode of operation tries to minimize the numbers of text extractions,
+   * which are very time intensive, at the cost of some rare cases, in which some
+   * signatures may not be found.
+   * </p>
+   */
+  public static final String VERIFY_MODE_SEMI_CONSERVATIVE = "semiConservative";
+
+  /**
+   * Binary and textual signatures are verified.
+   */
+  public static final String VERIFY_MODE_FULL_CONSERVATIVE = "fullConservative";
+
+  /**
+   * All signatures are verified.
+   */
+  public static final int VERIFY_ALL = -1;
+
+  /**
+   * The system property that may be used to declare the pdf-as configuration folder.
+   */
+  public static final String CONFIG_DIR_SYSTEM_PROPERTY = "pdf-as.work-dir";
+
+  /**
+   * The zip file containing the default configuration.
+   */
+  public static final String DEFAULT_CONFIGURATION_ZIP_RESOURCE = "DefaultConfiguration.zip";
+  
+  /**
+   * The configuration folder for pdf-as within the user's home folder.
+   */
+  public static final String USERHOME_CONFIG_FOLDER = "PDF-AS";
+  
+  /**
+   * The name of the directory, where temporary files are stored.
+   */
+  public static final String TEMP_DIR_NAME = "pdfastmp";
+  
+  public static final String BKU_HEADER_SIGNATURE_LAYOUT = "SignatureLayout";
+  
+  public static final String ADOBE_SIG_FILTER = AdobeSignatureHelper.ADOBE_SIG_FILTER;
+
+  /**
+   * Strict matching mode for placeholder extraction.<br/>
+   * If the placeholder with the given id is not found in the document, an exception will be thrown.
+   */
+  public static final int PLACEHOLDER_MATCH_MODE_STRICT = 0;
+  
+  /**
+   * A moderate matching mode for placeholder extraction.<br/>
+   * If the placeholder with the given id is not found in the document, the first placeholder without an id will be taken.<br/>
+   * If there is no such placeholder, the signature will be placed as usual, according to the pos parameter of the signature profile used.
+   */
+  public static final int PLACEHOLDER_MATCH_MODE_MODERATE = 1;
+  
+  /**
+   * A more lenient matching mode for placeholder extraction.<br/>
+   * If the placeholder with the given id is not found in the document, the first found placeholder will be taken, regardless if it has an id set, or not.<br/>
+   * If there is no placeholder at all, the signature will be placed as usual, according to the pos parameter of the signature profile used.
+   */
+  public static final int PLACEHOLDER_MATCH_MODE_LENIENT = 2;
+  
+  /**
+   * Identifier for QR based placeholders.
+   */
+  public static final String QR_PLACEHOLDER_IDENTIFIER = "PDF-AS-POS";
+  
+}
+