diff --git a/PDF_A/PDFA-2A.xml b/PDF_A/PDFA-2A.xml
index 32bdc13d..ec953699 100644
--- a/PDF_A/PDFA-2A.xml
+++ b/PDF_A/PDFA-2A.xml
@@ -1018,7 +1018,7 @@
             <description>The Unicode values specified in the ToUnicode CMap shall all be greater than zero (0), but not equal to either U+FEFF or U+FFFE</description>
             <test>toUnicode == null || (toUnicode.indexOf("\u0000") == -1 &amp;&amp; toUnicode.indexOf("\uFFFE") == -1 &amp;&amp; toUnicode.indexOf("\uFEFF") == -1)</test>
             <error>
-                <message>The glyph has an invalid Unicode value, which is either 0, or is equal to U+FEFF or U+FFFE</message>
+                <message>The glyph has Unicode value 0, U+FEFF or U+FFFE, which is invalid by Unicode standard</message>
                 <arguments/>
             </error>
             <references/>
@@ -1137,7 +1137,7 @@
         </rule>
         <rule object="PDWidgetAnnot">
             <id specification="ISO_19005_2" clause="6.4.1" testNumber="1"/>
-            <description>A Widget annotation dictionary shall not contains the A or AA keys</description>
+            <description>A Widget annotation dictionary shall not contain the A or AA keys</description>
             <test>containsA == false &amp;&amp; containsAA == false</test>
             <error>
                 <message>A Widget annotation contains %1 key(s)</message>
@@ -1149,7 +1149,7 @@
         </rule>
         <rule object="PDFormField">
             <id specification="ISO_19005_2" clause="6.4.1" testNumber="2"/>
-            <description>A Field dictionary shall not contains the A or AA keys</description>
+            <description>A Field dictionary shall not contain the A or AA keys</description>
             <test>containsAA == false</test>
             <error>
                 <message>A Form field dictionary contains the AA entry</message>
diff --git a/PDF_A/PDFA-2B.xml b/PDF_A/PDFA-2B.xml
index 602d9d15..bdf6aa62 100644
--- a/PDF_A/PDFA-2B.xml
+++ b/PDF_A/PDFA-2B.xml
@@ -1103,7 +1103,7 @@
         </rule>
         <rule object="PDWidgetAnnot">
             <id specification="ISO_19005_2" clause="6.4.1" testNumber="1"/>
-            <description>A Widget annotation dictionary shall not contains the A or AA keys</description>
+            <description>A Widget annotation dictionary shall not contain the A or AA keys</description>
             <test>containsA == false &amp;&amp; containsAA == false</test>
             <error>
                 <message>A Widget annotation contains %1 key(s)</message>
@@ -1115,7 +1115,7 @@
         </rule>
         <rule object="PDFormField">
             <id specification="ISO_19005_2" clause="6.4.1" testNumber="2"/>
-            <description>A Field dictionary shall not contains the A or AA keys</description>
+            <description>A Field dictionary shall not contain the A or AA keys</description>
             <test>containsAA == false</test>
             <error>
                 <message>A Form field dictionary contains the AA entry</message>
diff --git a/PDF_A/PDFA-2U.xml b/PDF_A/PDFA-2U.xml
index e323e5e6..1297e030 100644
--- a/PDF_A/PDFA-2U.xml
+++ b/PDF_A/PDFA-2U.xml
@@ -1018,7 +1018,7 @@
             <description>The Unicode values specified in the ToUnicode CMap shall all be greater than zero (0), but not equal to either U+FEFF or U+FFFE</description>
             <test>toUnicode == null || (toUnicode.indexOf("\u0000") == -1 &amp;&amp; toUnicode.indexOf("\uFFFE") == -1 &amp;&amp; toUnicode.indexOf("\uFEFF") == -1)</test>
             <error>
-                <message>The glyph has an invalid Unicode value, which is either 0, or is equal to U+FEFF or U+FFFE</message>
+                <message>The glyph has Unicode value 0, U+FEFF or U+FFFE, which is invalid by Unicode standard</message>
                 <arguments/>
             </error>
             <references/>
@@ -1125,7 +1125,7 @@
         </rule>
         <rule object="PDWidgetAnnot">
             <id specification="ISO_19005_2" clause="6.4.1" testNumber="1"/>
-            <description>A Widget annotation dictionary shall not contains the A or AA keys</description>
+            <description>A Widget annotation dictionary shall not contain the A or AA keys</description>
             <test>containsA == false &amp;&amp; containsAA == false</test>
             <error>
                 <message>A Widget annotation contains %1 key(s)</message>
@@ -1137,7 +1137,7 @@
         </rule>
         <rule object="PDFormField">
             <id specification="ISO_19005_2" clause="6.4.1" testNumber="2"/>
-            <description>A Field dictionary shall not contains the A or AA keys</description>
+            <description>A Field dictionary shall not contain the A or AA keys</description>
             <test>containsAA == false</test>
             <error>
                 <message>A Form field dictionary contains the AA entry</message>
diff --git a/PDF_A/PDFA-3A.xml b/PDF_A/PDFA-3A.xml
index 6bb38063..e4e3be24 100644
--- a/PDF_A/PDFA-3A.xml
+++ b/PDF_A/PDFA-3A.xml
@@ -1018,7 +1018,7 @@
             <description>The Unicode values specified in the ToUnicode CMap shall all be greater than zero (0), but not equal to either U+FEFF or U+FFFE</description>
             <test>toUnicode == null || (toUnicode.indexOf("\u0000") == -1 &amp;&amp; toUnicode.indexOf("\uFFFE") == -1 &amp;&amp; toUnicode.indexOf("\uFEFF") == -1)</test>
             <error>
-                <message>The glyph has an invalid Unicode value, which is either 0, or is equal to U+FEFF or U+FFFE</message>
+                <message>The glyph has Unicode value 0, U+FEFF or U+FFFE, which is invalid by Unicode standard</message>
                 <arguments/>
             </error>
             <references/>
@@ -1137,7 +1137,7 @@
         </rule>
         <rule object="PDWidgetAnnot">
             <id specification="ISO_19005_3" clause="6.4.1" testNumber="1"/>
-            <description>A Widget annotation dictionary shall not contains the A or AA keys</description>
+            <description>A Widget annotation dictionary shall not contain the A or AA keys</description>
             <test>containsA == false &amp;&amp; containsAA == false</test>
             <error>
                 <message>A Widget annotation contains %1 key(s)</message>
@@ -1149,7 +1149,7 @@
         </rule>
         <rule object="PDFormField">
             <id specification="ISO_19005_3" clause="6.4.1" testNumber="2"/>
-            <description>A Field dictionary shall not contains the A or AA keys</description>
+            <description>A Field dictionary shall not contain the A or AA keys</description>
             <test>containsAA == false</test>
             <error>
                 <message>A Form field dictionary contains the AA entry</message>
diff --git a/PDF_A/PDFA-3B.xml b/PDF_A/PDFA-3B.xml
index 5f6e5a03..bac86a9e 100644
--- a/PDF_A/PDFA-3B.xml
+++ b/PDF_A/PDFA-3B.xml
@@ -1103,7 +1103,7 @@
         </rule>
         <rule object="PDWidgetAnnot">
             <id specification="ISO_19005_3" clause="6.4.1" testNumber="1"/>
-            <description>A Widget annotation dictionary shall not contains the A or AA keys</description>
+            <description>A Widget annotation dictionary shall not contain the A or AA keys</description>
             <test>containsA == false &amp;&amp; containsAA == false</test>
             <error>
                 <message>A Widget annotation contains %1 key(s)</message>
@@ -1115,7 +1115,7 @@
         </rule>
         <rule object="PDFormField">
             <id specification="ISO_19005_3" clause="6.4.1" testNumber="2"/>
-            <description>A Field dictionary shall not contains the A or AA keys</description>
+            <description>A Field dictionary shall not contain the A or AA keys</description>
             <test>containsAA == false</test>
             <error>
                 <message>A Form field dictionary contains the AA entry</message>
diff --git a/PDF_A/PDFA-3U.xml b/PDF_A/PDFA-3U.xml
index 7070f7ad..58708227 100644
--- a/PDF_A/PDFA-3U.xml
+++ b/PDF_A/PDFA-3U.xml
@@ -1018,7 +1018,7 @@
             <description>The Unicode values specified in the ToUnicode CMap shall all be greater than zero (0), but not equal to either U+FEFF or U+FFFE</description>
             <test>toUnicode == null || (toUnicode.indexOf("\u0000") == -1 &amp;&amp; toUnicode.indexOf("\uFFFE") == -1 &amp;&amp; toUnicode.indexOf("\uFEFF") == -1)</test>
             <error>
-                <message>The glyph has an invalid Unicode value, which is either 0, or is equal to U+FEFF or U+FFFE</message>
+                <message>The glyph has Unicode value 0, U+FEFF or U+FFFE, which is invalid by Unicode standard</message>
                 <arguments/>
             </error>
             <references/>
@@ -1125,7 +1125,7 @@
         </rule>
         <rule object="PDWidgetAnnot">
             <id specification="ISO_19005_3" clause="6.4.1" testNumber="1"/>
-            <description>A Widget annotation dictionary shall not contains the A or AA keys</description>
+            <description>A Widget annotation dictionary shall not contain the A or AA keys</description>
             <test>containsA == false &amp;&amp; containsAA == false</test>
             <error>
                 <message>A Widget annotation contains %1 key(s)</message>
@@ -1137,7 +1137,7 @@
         </rule>
         <rule object="PDFormField">
             <id specification="ISO_19005_3" clause="6.4.1" testNumber="2"/>
-            <description>A Field dictionary shall not contains the A or AA keys</description>
+            <description>A Field dictionary shall not contain the A or AA keys</description>
             <test>containsAA == false</test>
             <error>
                 <message>A Form field dictionary contains the AA entry</message>
diff --git a/PDF_A/PDFA-4.xml b/PDF_A/PDFA-4.xml
index 101f77f9..1b40dcba 100644
--- a/PDF_A/PDFA-4.xml
+++ b/PDF_A/PDFA-4.xml
@@ -836,7 +836,7 @@
             <description>For all non-symbolic TrueType fonts used for rendering, the embedded TrueType font program shall contain at least Microsoft Unicode (3,1 – Platform ID=3, Encoding ID=1), or Macintosh Roman (1,0 – Platform ID=1, Encoding ID=0) 'cmap' subtable that all necessary glyph lookups are able to be carried out</description>
             <test>isSymbolic == true || cmap31Present == true || cmap10Present == true</test>
             <error>
-                <message>The embedded font program for a non-symbolic TrueType font does not contain Microsoft Symbol (3,0 – Platform ID=3, Encoding ID=0) or the Mac Roman (1,0 – Platform ID=1, Encoding ID=0) encoding</message>
+                <message>The embedded font program for a non-symbolic TrueType font does not contain Microsoft Symbol (3,1 – Platform ID=3, Encoding ID=1) or the Mac Roman (1,0 – Platform ID=1, Encoding ID=0) encoding</message>
                 <arguments/>
             </error>
             <references/>
@@ -880,7 +880,7 @@
             <description>If a ToUnicode CMap is present, the Unicode values specified there shall all be greater than zero (0), but not equal to either U+FEFF or U+FFFE</description>
             <test>toUnicode == null || (toUnicode.indexOf("\u0000") == -1 &amp;&amp; toUnicode.indexOf("\uFFFE") == -1 &amp;&amp; toUnicode.indexOf("\uFEFF") == -1)</test>
             <error>
-                <message>The glyph has an invalid Unicode value, which is either 0, or is equal to U+FEFF or U+FFFE</message>
+                <message>The glyph has Unicode value 0, U+FEFF or U+FFFE, which is invalid by Unicode standard</message>
                 <arguments/>
             </error>
             <references/>
@@ -890,7 +890,7 @@
             <description>The ActualText entry shall not contain any PUA values</description>
             <test>containsPUA == false</test>
             <error>
-                <message>The ActualText entry contains a Private Unicode Area value</message>
+                <message>The ActualText entry contains Unicode PUA (Private Use Area) code points</message>
                 <arguments/>
             </error>
             <references/>
diff --git a/PDF_A/PDFA-4E.xml b/PDF_A/PDFA-4E.xml
index b1a8c3e7..73a32682 100644
--- a/PDF_A/PDFA-4E.xml
+++ b/PDF_A/PDFA-4E.xml
@@ -850,7 +850,7 @@
             <description>For all non-symbolic TrueType fonts used for rendering, the embedded TrueType font program shall contain at least Microsoft Unicode (3,1 – Platform ID=3, Encoding ID=1), or Macintosh Roman (1,0 – Platform ID=1, Encoding ID=0) 'cmap' subtable that all necessary glyph lookups are able to be carried out</description>
             <test>isSymbolic == true || cmap31Present == true || cmap10Present == true</test>
             <error>
-                <message>The embedded font program for a non-symbolic TrueType font does not contain Microsoft Symbol (3,0 – Platform ID=3, Encoding ID=0) or the Mac Roman (1,0 – Platform ID=1, Encoding ID=0) encoding</message>
+                <message>The embedded font program for a non-symbolic TrueType font does not contain Microsoft Symbol (3,1 – Platform ID=3, Encoding ID=1) or the Mac Roman (1,0 – Platform ID=1, Encoding ID=0) encoding</message>
                 <arguments/>
             </error>
             <references/>
@@ -894,7 +894,7 @@
             <description>If a ToUnicode CMap is present, the Unicode values specified there shall all be greater than zero (0), but not equal to either U+FEFF or U+FFFE</description>
             <test>toUnicode == null || (toUnicode.indexOf("\u0000") == -1 &amp;&amp; toUnicode.indexOf("\uFFFE") == -1 &amp;&amp; toUnicode.indexOf("\uFEFF") == -1)</test>
             <error>
-                <message>The glyph has an invalid Unicode value, which is either 0, or is equal to U+FEFF or U+FFFE</message>
+                <message>The glyph has Unicode value 0, U+FEFF or U+FFFE, which is invalid by Unicode standard</message>
                 <arguments/>
             </error>
             <references/>
@@ -904,7 +904,7 @@
             <description>The ActualText entry shall not contain any PUA values</description>
             <test>containsPUA == false</test>
             <error>
-                <message>The ActualText entry contains a Private Unicode Area value</message>
+                <message>The ActualText entry contains Unicode PUA (Private Use Area) code points</message>
                 <arguments/>
             </error>
             <references/>
diff --git a/PDF_A/PDFA-4F.xml b/PDF_A/PDFA-4F.xml
index 81c1584c..f9a4ddff 100644
--- a/PDF_A/PDFA-4F.xml
+++ b/PDF_A/PDFA-4F.xml
@@ -836,7 +836,7 @@
             <description>For all non-symbolic TrueType fonts used for rendering, the embedded TrueType font program shall contain at least Microsoft Unicode (3,1 – Platform ID=3, Encoding ID=1), or Macintosh Roman (1,0 – Platform ID=1, Encoding ID=0) 'cmap' subtable that all necessary glyph lookups are able to be carried out</description>
             <test>isSymbolic == true || cmap31Present == true || cmap10Present == true</test>
             <error>
-                <message>The embedded font program for a non-symbolic TrueType font does not contain Microsoft Symbol (3,0 – Platform ID=3, Encoding ID=0) or the Mac Roman (1,0 – Platform ID=1, Encoding ID=0) encoding</message>
+                <message>The embedded font program for a non-symbolic TrueType font does not contain Microsoft Symbol (3,1 – Platform ID=3, Encoding ID=1) or the Mac Roman (1,0 – Platform ID=1, Encoding ID=0) encoding</message>
                 <arguments/>
             </error>
             <references/>
@@ -880,7 +880,7 @@
             <description>If a ToUnicode CMap is present, the Unicode values specified there shall all be greater than zero (0), but not equal to either U+FEFF or U+FFFE</description>
             <test>toUnicode == null || (toUnicode.indexOf("\u0000") == -1 &amp;&amp; toUnicode.indexOf("\uFFFE") == -1 &amp;&amp; toUnicode.indexOf("\uFEFF") == -1)</test>
             <error>
-                <message>The glyph has an invalid Unicode value, which is either 0, or is equal to U+FEFF or U+FFFE</message>
+                <message>The glyph has Unicode value 0, U+FEFF or U+FFFE, which is invalid by Unicode standard</message>
                 <arguments/>
             </error>
             <references/>
@@ -890,7 +890,7 @@
             <description>The ActualText entry shall not contain any PUA values</description>
             <test>containsPUA == false</test>
             <error>
-                <message>The ActualText entry contains a Private Unicode Area value</message>
+                <message>The ActualText entry contains Unicode PUA (Private Use Area) code points</message>
                 <arguments/>
             </error>
             <references/>