diff --git a/examples/matroskachapters.dtd b/examples/matroskachapters.dtd
index 74a16fecf..e3ac8935f 100644
--- a/examples/matroskachapters.dtd
+++ b/examples/matroskachapters.dtd
@@ -26,6 +26,8 @@
           ChapterAtom*)>
 
 <!ELEMENT ChapterTrack (ChapterTrackNumber)>
+<!ELEMENT ChapterTrackNumber (#PCDATA)>
+
 <!ELEMENT ChapterDisplay (
           ChapterString,
           ChapterLanguage+,
diff --git a/examples/matroskatags.dtd b/examples/matroskatags.dtd
index 4b3695877..5779fa6ef 100644
--- a/examples/matroskatags.dtd
+++ b/examples/matroskatags.dtd
@@ -25,5 +25,8 @@
           TagLanguage?,
           DefaultLanguage?,
           Simple*)>
+<!ELEMENT Name (#PCDATA)>
+<!ELEMENT String (#PCDATA)>
+<!ELEMENT Binary (#PCDATA)>
 <!ELEMENT TagLanguage (#PCDATA)>
 <!ELEMENT DefaultLanguage (#PCDATA)>