diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/BooleanFilter.xml b/src/Lucene.Net.Tests.QueryParser/Xml/BooleanFilter.xml
index c49c886b5e..a72860da2a 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/BooleanFilter.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/BooleanFilter.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/BooleanQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/BooleanQuery.xml
index bba1d340d5..5b04f6ccd6 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/BooleanQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/BooleanQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/BoostingQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/BoostingQuery.xml
index 22d142e7bc..d8eef6c5aa 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/BoostingQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/BoostingQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/BoostingTermQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/BoostingTermQuery.xml
index 65bbd61867..88635ce457 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/BoostingTermQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/BoostingTermQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/CachedFilter.xml b/src/Lucene.Net.Tests.QueryParser/Xml/CachedFilter.xml
index 06d253ae7d..618a662cc6 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/CachedFilter.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/CachedFilter.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/ConstantScoreQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/ConstantScoreQuery.xml
index c5994d1687..ca20b1137c 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/ConstantScoreQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/ConstantScoreQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/DisjunctionMaxQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/DisjunctionMaxQuery.xml
index eb47816520..eb73d578ee 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/DisjunctionMaxQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/DisjunctionMaxQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/DuplicateFilterQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/DuplicateFilterQuery.xml
index 196e3959a7..6b5e48edc1 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/DuplicateFilterQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/DuplicateFilterQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/FuzzyLikeThisQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/FuzzyLikeThisQuery.xml
index 9241c98d33..12da45edb8 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/FuzzyLikeThisQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/FuzzyLikeThisQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/LikeThisQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/LikeThisQuery.xml
index b36cea76d0..2107b7345c 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/LikeThisQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/LikeThisQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/MatchAllDocsQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/MatchAllDocsQuery.xml
index 0fe52157dc..73f8bc43da 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/MatchAllDocsQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/MatchAllDocsQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/NestedBooleanQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/NestedBooleanQuery.xml
index d29268aaa9..ab6381cc75 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/NestedBooleanQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/NestedBooleanQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/NumericRangeFilterQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/NumericRangeFilterQuery.xml
index b88a9731b9..9c540daa95 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/NumericRangeFilterQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/NumericRangeFilterQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/NumericRangeQueryQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/NumericRangeQueryQuery.xml
index f72a63fd48..9eb0083b34 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/NumericRangeQueryQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/NumericRangeQueryQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/RangeFilterQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/RangeFilterQuery.xml
index 33aaebe59c..00b22b9a11 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/RangeFilterQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/RangeFilterQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/SpanQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/SpanQuery.xml
index 84a97b2405..92cdbf31ff 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/SpanQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/SpanQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/TermQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/TermQuery.xml
index 14dae37cac..4c873935a6 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/TermQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/TermQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/TermsFilterQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/TermsFilterQuery.xml
index 4de99d7828..3db4338b9a 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/TermsFilterQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/TermsFilterQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/TermsQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/TermsQuery.xml
index 594ea2ea00..54d8a2189b 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/TermsQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/TermsQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/UserInputQuery.xml b/src/Lucene.Net.Tests.QueryParser/Xml/UserInputQuery.xml
index 5c14f1a2c8..f768fbe1be 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/UserInputQuery.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/UserInputQuery.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/Lucene.Net.Tests.QueryParser/Xml/UserInputQueryCustomField.xml b/src/Lucene.Net.Tests.QueryParser/Xml/UserInputQueryCustomField.xml
index 7b35a63396..3476bda8a0 100644
--- a/src/Lucene.Net.Tests.QueryParser/Xml/UserInputQueryCustomField.xml
+++ b/src/Lucene.Net.Tests.QueryParser/Xml/UserInputQueryCustomField.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
diff --git a/src/java/index-compat/pom.xml b/src/java/index-compat/pom.xml
index 730fa94602..f0daa03cc8 100644
--- a/src/java/index-compat/pom.xml
+++ b/src/java/index-compat/pom.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <!--
 
  Licensed to the Apache Software Foundation (ASF) under one