diff --git a/PDF_UA/PDFUA-1.xml b/PDF_UA/PDFUA-1.xml
index 2720176b..82ec59da 100644
--- a/PDF_UA/PDFUA-1.xml
+++ b/PDF_UA/PDFUA-1.xml
@@ -562,7 +562,7 @@
         <rule object="SEMarkedContent" tags="lang,alt-text">
             <id specification="ISO_14289_1" clause="7.2" testNumber="30"/>
             <description>Natural language for text in ActualText attribute in Span Marked Content shall be determined</description>
-            <test>tag != 'Span' || ActualText == null || Lang_size != 0 || inheritedLang != null || gSizeCatalogLang != 0</test>
+            <test>tag != 'Span' || ActualText == null || Lang != null || inheritedLang != null || gSizeCatalogLang != 0</test>
             <error>
                 <message>Natural language for text in ActualText attribute in Span Marked Content cannot be determined</message>
                 <arguments/>
@@ -572,7 +572,7 @@
         <rule object="SEMarkedContent" tags="lang,alt-text">
             <id specification="ISO_14289_1" clause="7.2" testNumber="31"/>
             <description>Natural language for text in Alt attribute in Span Marked Content shall be determined</description>
-            <test>tag != 'Span' || Alt == null || Lang_size != 0 || inheritedLang != null || gSizeCatalogLang != 0</test>
+            <test>tag != 'Span' || Alt == null || Lang != null || inheritedLang != null || gSizeCatalogLang != 0</test>
             <error>
                 <message>Natural language for text in Alt attribute in Span Marked Content cannot be determined</message>
                 <arguments/>
@@ -582,7 +582,7 @@
         <rule object="SEMarkedContent" tags="lang,alt-text">
             <id specification="ISO_14289_1" clause="7.2" testNumber="32"/>
             <description>Natural language for text in E attribute in Span Marked Content shall be determined</description>
-            <test>tag != 'Span' || E == null || Lang_size != 0 || inheritedLang != null || gSizeCatalogLang != 0</test>
+            <test>tag != 'Span' || E == null || Lang != null || inheritedLang != null || gSizeCatalogLang != 0</test>
             <error>
                 <message>Natural language for text in E attribute in Span Marked Content cannot be determined</message>
                 <arguments/>
diff --git a/PDF_UA/WCAG-21-Complete.xml b/PDF_UA/WCAG-21-Complete.xml
index 375d971f..6faa5fc4 100644
--- a/PDF_UA/WCAG-21-Complete.xml
+++ b/PDF_UA/WCAG-21-Complete.xml
@@ -1350,7 +1350,7 @@
         <rule object="SEMarkedContent" tags="major,machine,lang,alt-text">
             <id specification="ISO_14289_1" clause="7.2" testNumber="30"/>
             <description>Natural language for text in ActualText attribute in Span Marked Content shall be determined</description>
-            <test>tag != 'Span' || ActualText == null || Lang_size != 0 || inheritedLang != null || gSizeCatalogLang != 0</test>
+            <test>tag != 'Span' || ActualText == null || Lang != null || inheritedLang != null || gSizeCatalogLang != 0</test>
             <error>
                 <message>Natural language for text in ActualText attribute in Span Marked Content cannot be determined</message>
                 <arguments/>
@@ -1360,7 +1360,7 @@
         <rule object="SEMarkedContent" tags="major,machine,lang,alt-text">
             <id specification="ISO_14289_1" clause="7.2" testNumber="31"/>
             <description>Natural language for text in Alt attribute in Span Marked Content shall be determined</description>
-            <test>tag != 'Span' || Alt == null || Lang_size != 0 || inheritedLang != null || gSizeCatalogLang != 0</test>
+            <test>tag != 'Span' || Alt == null || Lang != null || inheritedLang != null || gSizeCatalogLang != 0</test>
             <error>
                 <message>Natural language for text in Alt attribute in Span Marked Content cannot be determined</message>
                 <arguments/>
@@ -1370,7 +1370,7 @@
         <rule object="SEMarkedContent" tags="major,machine,lang,alt-text">
             <id specification="ISO_14289_1" clause="7.2" testNumber="32"/>
             <description>Natural language for text in E attribute in Span Marked Content shall be determined</description>
-            <test>tag != 'Span' || E == null || Lang_size != 0 || inheritedLang != null || gSizeCatalogLang != 0</test>
+            <test>tag != 'Span' || E == null || Lang != null || inheritedLang != null || gSizeCatalogLang != 0</test>
             <error>
                 <message>Natural language for text in E attribute in Span Marked Content cannot be determined</message>
                 <arguments/>