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diff --git a/spss/server/serverlib/src/main/java/at/gv/egovernment/moa/spss/api/common/XPathFilter.java b/spss/server/serverlib/src/main/java/at/gv/egovernment/moa/spss/api/common/XPathFilter.java
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+++ b/spss/server/serverlib/src/main/java/at/gv/egovernment/moa/spss/api/common/XPathFilter.java
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+/*
+ * Copyright 2003 Federal Chancellery Austria
+ * MOA-SPSS has been developed in a cooperation between BRZ, the Federal
+ * Chancellery Austria - ICT staff unit, 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.egovernment.moa.spss.api.common;
+
+import java.util.Map;
+
+/**
+ * An XPath expression set operation.
+ * 
+ * @author Patrick Peck
+ * @version $Id$
+ */
+public interface XPathFilter {
+  /** Subtract this filter's node set from the resulting node set. */
+  public static final String SUBTRACT_TYPE = "subtract";
+  /** Intersect this filter's node set with the resulting node set. */
+  public static final String INTERSECT_TYPE = "intersect";
+  /** Compute the union of this filter's node set and the resulting node set. */
+  public static final String UNION_TYPE = "union";
+  
+  /**
+   * Gets the type of this <code>XPathFilter</code>.
+   * 
+   * @return The type of this <code>XPathFilter</code>.
+   */
+  public String getFilterType();
+  /**
+   * Gets the XPath expression for selecting the nodes.
+   * 
+   * @return The XPath expression for selecting the nodes.
+   */
+  public String getXPathExpression();
+  /**
+   * Gets The namespace prefix to URI mapping used during evaluation of the
+   * XPath expression.
+   * 
+   * @return The namespace prefix to URI mapping.
+   */
+  public Map getNamespaceDeclarations();
+}