diff --git a/common/source/java/ch/systemsx/cisd/common/db/DBUtils.java b/common/source/java/ch/systemsx/cisd/common/db/DBUtils.java
index 337c82e691768909740a7a3c679c8cdbab0cfdd1..85ae6691fc1dc9e038a1c0a7cdffb1bd9f0e4c6a 100644
--- a/common/source/java/ch/systemsx/cisd/common/db/DBUtils.java
+++ b/common/source/java/ch/systemsx/cisd/common/db/DBUtils.java
@@ -40,15 +40,15 @@ public final class DBUtils
     }
 
     /**
-     * Translates given regular expression to database-like form if possible. Returns
+     * Translates given regular expression to database-like pattern if possible. Returns
      * <code>null</code> if translation is not possible.
      * 
-     * @return regular expression in database-like form, or <code>null</code> if translation is not
-     *         possible.
+     * @return regular expression in database-like pattern, or <code>null</code> if translation is
+     *         not possible.
      */
-    public static String tryToTranslateRegExpToLikeForm(String patternOrNull)
+    public static String tryToTranslateRegExpToLikePattern(String regexpOrNull)
     {
-        if (StringUtils.isBlank(patternOrNull))
+        if (StringUtils.isBlank(regexpOrNull))
         {
             return null;
         }
@@ -56,7 +56,7 @@ public final class DBUtils
         StringBuilder result = new StringBuilder();
 
         int startPosition = 0;
-        if (patternOrNull.startsWith("^"))
+        if (regexpOrNull.startsWith("^"))
         {
             startPosition++;
         } else
@@ -64,9 +64,9 @@ public final class DBUtils
             result.append('%');
         }
 
-        while (startPosition < patternOrNull.length())
+        while (startPosition < regexpOrNull.length())
         {
-            char ch = patternOrNull.charAt(startPosition);
+            char ch = regexpOrNull.charAt(startPosition);
             if (Character.isLetter(ch) || Character.isDigit(ch) || Character.isWhitespace(ch))
             { // just copy letters, digits and whitespaces
                 result.append(ch);
@@ -98,13 +98,13 @@ public final class DBUtils
                         break;
                     case '.': // translates . to _, .* to % and .+ to _%
                         startPosition++;
-                        if (startPosition < patternOrNull.length()
-                                && patternOrNull.charAt(startPosition) == '*')
+                        if (startPosition < regexpOrNull.length()
+                                && regexpOrNull.charAt(startPosition) == '*')
                         {
                             result.append('%');
                             startPosition++;
-                        } else if (startPosition < patternOrNull.length()
-                                && patternOrNull.charAt(startPosition) == '+')
+                        } else if (startPosition < regexpOrNull.length()
+                                && regexpOrNull.charAt(startPosition) == '+')
                         {
                             result.append('_').append('%');
                             startPosition++;
@@ -115,16 +115,16 @@ public final class DBUtils
                         break;
                     case '$': // end of string
                         startPosition++;
-                        if (startPosition < patternOrNull.length())
+                        if (startPosition < regexpOrNull.length())
                         {
                             result.append(ch);
                         }
                         break;
                     case '\\': // unescape characters
                         startPosition++;
-                        if (startPosition < patternOrNull.length())
+                        if (startPosition < regexpOrNull.length())
                         {
-                            char escaped = patternOrNull.charAt(startPosition);
+                            char escaped = regexpOrNull.charAt(startPosition);
                             switch (escaped)
                             {
                                 case '\\':
@@ -179,7 +179,7 @@ public final class DBUtils
         }
 
         // check if we should match end of patters in exact way
-        if (false == patternOrNull.endsWith("$"))
+        if (false == regexpOrNull.endsWith("$"))
         {
             result.append('%');
         }
diff --git a/common/sourceTest/java/ch/systemsx/cisd/common/db/DBUtilsTest.java b/common/sourceTest/java/ch/systemsx/cisd/common/db/DBUtilsTest.java
index e1ce6a3ac519cf929985f2df5112e603b20576a3..8fa6adae0e12f18990180606f8d3a0579914e7e1 100644
--- a/common/sourceTest/java/ch/systemsx/cisd/common/db/DBUtilsTest.java
+++ b/common/sourceTest/java/ch/systemsx/cisd/common/db/DBUtilsTest.java
@@ -27,20 +27,20 @@ public class DBUtilsTest
     @Test
     public void testTryToTranslateRegExpToLikeForm()
     {
-        Assert.assertEquals(DBUtils.tryToTranslateRegExpToLikeForm("^test$"), "test");
-        Assert.assertEquals(DBUtils.tryToTranslateRegExpToLikeForm("ala ma kota"), "%ala ma kota%");
-        Assert.assertEquals(DBUtils.tryToTranslateRegExpToLikeForm("^ala/.*/kota$"), "ala/%/kota");
-        Assert.assertEquals(DBUtils.tryToTranslateRegExpToLikeForm("^ala.ma\\.kota$"),
+        Assert.assertEquals(DBUtils.tryToTranslateRegExpToLikePattern("^test$"), "test");
+        Assert.assertEquals(DBUtils.tryToTranslateRegExpToLikePattern("ala ma kota"), "%ala ma kota%");
+        Assert.assertEquals(DBUtils.tryToTranslateRegExpToLikePattern("^ala/.*/kota$"), "ala/%/kota");
+        Assert.assertEquals(DBUtils.tryToTranslateRegExpToLikePattern("^ala.ma\\.kota$"),
                 "ala_ma.kota");
-        Assert.assertEquals(DBUtils.tryToTranslateRegExpToLikeForm("^ala.+ma\\+kota$"),
+        Assert.assertEquals(DBUtils.tryToTranslateRegExpToLikePattern("^ala.+ma\\+kota$"),
                 "ala_%ma+kota");
 
-        Assert.assertEquals(DBUtils.tryToTranslateRegExpToLikeForm("^ala%ma_ko\\\\ta$"),
+        Assert.assertEquals(DBUtils.tryToTranslateRegExpToLikePattern("^ala%ma_ko\\\\ta$"),
                 "ala\\%ma\\_ko\\\\ta");
-        Assert.assertEquals(DBUtils.tryToTranslateRegExpToLikeForm("^$"), "");
+        Assert.assertEquals(DBUtils.tryToTranslateRegExpToLikePattern("^$"), "");
 
-        Assert.assertNull(DBUtils.tryToTranslateRegExpToLikeForm(null));
-        Assert.assertNull(DBUtils.tryToTranslateRegExpToLikeForm("ala(ma|kota)"));
-        Assert.assertNull(DBUtils.tryToTranslateRegExpToLikeForm("a*la"));
+        Assert.assertNull(DBUtils.tryToTranslateRegExpToLikePattern(null));
+        Assert.assertNull(DBUtils.tryToTranslateRegExpToLikePattern("ala(ma|kota)"));
+        Assert.assertNull(DBUtils.tryToTranslateRegExpToLikePattern("a*la"));
     }
 }
diff --git a/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/server/DatabaseBasedDataSetPathInfoProvider.java b/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/server/DatabaseBasedDataSetPathInfoProvider.java
index 2f60e9f87aeb8dbcb4a348f121e465f58a2ea3a7..26b00c779061b991709f4ad42c756f92ccb95128 100644
--- a/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/server/DatabaseBasedDataSetPathInfoProvider.java
+++ b/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/server/DatabaseBasedDataSetPathInfoProvider.java
@@ -84,8 +84,9 @@ public class DatabaseBasedDataSetPathInfoProvider implements IDataSetPathInfoPro
         public List<DataSetFileRecord> listDataSetFilesByRelativePathLikeExpression(long dataSetId,
                 String relativePathLikeExpression);
 
+        // FIXME we should have 2 methods, one with regexp one with like
         @Select(SELECT_DATA_SET_FILES
-                + "WHERE dase_id = ?{1} AND relative_path like '?{2}' AND file_name ~ ?{3}")
+                + "WHERE dase_id = ?{1} AND relative_path = '?{2}' AND file_name ~ ?{3}")
         public List<DataSetFileRecord> listDataSetFilesByFilenameRegex(long dataSetId,
                 String startingPath, String filenameRegex);
     }
@@ -115,7 +116,7 @@ public class DatabaseBasedDataSetPathInfoProvider implements IDataSetPathInfoPro
                 public List<DataSetFileRecord> listDataSetFiles(long dataSetId)
                 {
                     String likeExpressionOrNull =
-                            DBUtils.tryToTranslateRegExpToLikeForm("^" + regularExpression + "$");
+                            DBUtils.tryToTranslateRegExpToLikePattern("^" + regularExpression + "$");
 
                     if (likeExpressionOrNull == null)
                     {
@@ -196,7 +197,7 @@ public class DatabaseBasedDataSetPathInfoProvider implements IDataSetPathInfoPro
         public List<DataSetPathInfo> listMatchingPathInfos(String relativePathPattern)
         {
             String likeExpressionOrNull =
-                    DBUtils.tryToTranslateRegExpToLikeForm(prepareDBStyleRegex(relativePathPattern));
+                    DBUtils.tryToTranslateRegExpToLikePattern(prepareDBStyleRegex(relativePathPattern));
             List<DataSetFileRecord> records;
             if (likeExpressionOrNull == null)
             {
@@ -206,7 +207,8 @@ public class DatabaseBasedDataSetPathInfoProvider implements IDataSetPathInfoPro
             } else
             {
                 records =
-                        dao.listDataSetFilesByRelativePathLikeExpression(dataSetId, likeExpressionOrNull);
+                        dao.listDataSetFilesByRelativePathLikeExpression(dataSetId,
+                                likeExpressionOrNull);
             }
             return asPathInfos(records);
         }
diff --git a/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/shared/HierarchicalContentProvider.java b/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/shared/HierarchicalContentProvider.java
index d94f6683f728d1ce83ddf1d64e7cb0d846e7f46f..6230dcb80ff5180d1595e781c7381d61df0889fe 100644
--- a/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/shared/HierarchicalContentProvider.java
+++ b/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/shared/HierarchicalContentProvider.java
@@ -107,7 +107,6 @@ public class HierarchicalContentProvider implements IHierarchicalContentProvider
         }
     }
 
-
     private IHierarchicalContent tryCreateComponentContent(ExternalData component)
     {
         try
@@ -129,7 +128,7 @@ public class HierarchicalContentProvider implements IHierarchicalContentProvider
 
     public IHierarchicalContent asContent(final IDatasetLocation datasetLocation)
     {
-        // NOTE: remember to call IHierarchicalContent.close() to unlock the dataset when finished
+        // NOTE: remember to call IHierarchicalContent.close() to unlock the data set when finished
         // working with the IHierarchivalContent
         directoryProvider.getShareIdManager().lock(datasetLocation.getDataSetCode());
         File dataSetDirectory = directoryProvider.getDataSetDirectory(datasetLocation);
diff --git a/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/shared/IHierarchicalContentProvider.java b/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/shared/IHierarchicalContentProvider.java
index 00f88e03adae307241b3a6b33b92a18a3c99f0cf..40b1e49ef456a274c8a77df83723989130686067 100644
--- a/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/shared/IHierarchicalContentProvider.java
+++ b/datastore_server/source/java/ch/systemsx/cisd/openbis/dss/generic/shared/IHierarchicalContentProvider.java
@@ -26,7 +26,7 @@ import ch.systemsx.cisd.openbis.generic.shared.basic.dto.IDatasetLocation;
  * A provider of {@link IHierarchicalContent} for given data set.
  * <p>
  * <b>NOTE</b>{@link IHierarchicalContent#close()} needs to be called to release resources when
- * working with the content is done. Otherwise data set may e.g. remain locked in its share until
+ * working with the content is done. Otherwise data set will remain locked in its share until
  * timeout occurs.
  * 
  * @author Piotr Buczek
@@ -36,7 +36,7 @@ public interface IHierarchicalContentProvider
 {
 
     /**
-     * This is method needs to access openBIS DB to retrieve information first.
+     * This method needs to access openBIS DB to retrieve information first.
      * 
      * @return {@link IHierarchicalContent} for the specified data set
      * @throws IllegalArgumentException if data set doesn't exist in openBIS DB
@@ -55,7 +55,7 @@ public interface IHierarchicalContentProvider
 
     /**
      * @return {@link IHierarchicalContent} for the specified data set
-     * @deprecated doesn't support abstraction for virtual data sets, use {@link #asContent(String)}
+     * @deprecated doesn't support container data sets, use {@link #asContent(String)}
      */
     @Deprecated
     IHierarchicalContent asContent(IDatasetLocation datasetLocation);
@@ -65,7 +65,7 @@ public interface IHierarchicalContentProvider
      * 
      * @param datasetDirectory the directory file of the data set
      * @return {@link IHierarchicalContent} for the specified data set
-     * @deprecated doesn't support abstraction for virtual data sets, use {@link #asContent(String)}
+     * @deprecated doesn't support container data sets, use {@link #asContent(String)}
      */
     @Deprecated
     IHierarchicalContent asContent(File datasetDirectory);