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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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1 /*
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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2 * eXist Open Source Native XML Database: Extension module
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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3 * Copyright (C) 2008 Josef Willenborg
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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4 * jwillenborg@mpiwg-berlin.mpg.de
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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5 * http://www.mpiwg-berlin.mpg.de
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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6 *
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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7 * This program is free software; you can redistribute it and/or
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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8 * modify it under the terms of the GNU Lesser General Public License
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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9 * as published by the Free Software Foundation; either version 2
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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10 * of the License, or (at your option) any later version.
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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11 *
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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12 * This program is distributed in the hope that it will be useful,
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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15 * GNU Lesser General Public License for more details.
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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16 *
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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17 * You should have received a copy of the GNU Lesser General Public License
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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18 * along with this program; if not, write to the Free Software
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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20 *
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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21 * $Id: TextModule.java $
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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22 */
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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23 package org.exist.xquery.modules.mpdltext;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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24
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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25 import org.apache.lucene.queryParser.ParseException;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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26 import org.apache.lucene.queryParser.QueryParser;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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27 import org.exist.dom.QName;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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28 import org.exist.xquery.BasicFunction;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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29 import org.exist.xquery.Cardinality;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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30 import org.exist.xquery.FunctionSignature;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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31 import org.exist.xquery.XPathException;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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32 import org.exist.xquery.XQueryContext;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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33 import org.exist.xquery.value.Sequence;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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34 import org.exist.xquery.value.SequenceType;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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35 import org.exist.xquery.value.StringValue;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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36 import org.exist.xquery.value.Type;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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37 import org.exist.xquery.value.ValueSequence;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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38
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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39 import de.mpg.mpiwg.berlin.mpdl.analysis.MpdlStandardAnalyzer;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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40
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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41 /**
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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42 * @author Josef Willenborg (jwillenborg@mpiwg-berlin.mpg.de)
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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43 */
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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44 public class LuceneQueryParser extends BasicFunction {
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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45
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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46 public final static FunctionSignature signature =
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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47 new FunctionSignature(
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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48 new QName("lucene-parse-query", MPDLTextModule.NAMESPACE_URI, MPDLTextModule.PREFIX),
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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49 "A function which parses the given lucene query and returns an error message",
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50 new SequenceType[] { new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE) },
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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51 new SequenceType(Type.STRING, Cardinality.EXACTLY_ONE));
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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52
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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53 public LuceneQueryParser(XQueryContext context) {
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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54 super(context, signature);
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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55 }
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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56
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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57 public Sequence eval(Sequence[] args, Sequence contextSequence) throws XPathException {
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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58 String retMessage = "";
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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59 ValueSequence result = new ValueSequence();
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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60 Sequence luceneQueryStringSeq = args[0];
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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61 if (luceneQueryStringSeq.isEmpty()) {
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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62 result.add(new StringValue(""));
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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63 return result;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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64 }
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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65 String luceneQueryString = luceneQueryStringSeq.getStringValue();
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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66 if (luceneQueryString == null || luceneQueryString.equals("")) {
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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67 result.add(new StringValue(""));
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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68 return result;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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69 }
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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70 try {
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71 MpdlStandardAnalyzer analyzer = new MpdlStandardAnalyzer();
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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72 QueryParser parser = new QueryParser("", analyzer);
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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73 parser.parse(luceneQueryString);
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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74 } catch (ParseException e) {
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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75 retMessage = e.getMessage();
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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76 }
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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77 result.add(new StringValue(retMessage));
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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78 return result;
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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79 }
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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80
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Josef Willenborg <jwillenborg@mpiwg-berlin.mpg.de>
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81 }
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