diff --git a/spec/data-model/README.md b/spec/data-model/README.md
index 1194b331e4..4058894b56 100644
--- a/spec/data-model/README.md
+++ b/spec/data-model/README.md
@@ -1,4 +1,4 @@
-# MessageFormat 2.0 Data Model
+# Interchange Data Model
 
 This section defines a data model representation of MessageFormat 2 _messages_.
 
@@ -33,26 +33,14 @@ This data model might also be used to:
 
 To ensure compatibility across all platforms,
 this interchange data model is defined here using TypeScript notation.
-Two equivalent definitions of the data model are also provided:
-
-- [`message.json`](./message.json) is a JSON Schema definition,
-  for use with message data encoded as JSON or compatible formats, such as YAML.
-- [`message.dtd`](./message.dtd) is a document type definition (DTD),
-  for use with message data encoded as XML.
+An equivalent JSON Schema definition [`message.json`](./message.json) is also provided,
+for use with message data encoded as JSON or compatible formats, such as YAML.
 
 Note that while the data model description below is the canonical one,
-the JSON and DTD definitions are intended for interchange between systems and processors.
-To that end, they relax some aspects of the data model, such as allowing
+the JSON Schema definition is intended for interchange between systems and processors.
+To that end, it relaxes some aspects of the data model, such as allowing
 declarations, options, and attributes to be optional rather than required properties.
 
-> [!NOTE]
-> Users relying on XML representations of messages should note that
-> XML 1.0 does not allow for the representation of all C0 control characters (U+0000-U+001F).
-> Except for U+0000 NULL , these characters are allowed in MessageFormat 2 messages,
-> so systems and users relying on this XML representation for interchange
-> might need to supply an alternate escape mechanism to support messages
-> that contain these characters.
-
 > [!IMPORTANT]
 > The data model uses the field name `name` to denote various interface identifiers.
 > In the MessageFormat 2 [syntax](/spec/syntax.md), the source for these `name` fields
diff --git a/spec/data-model/message.dtd b/spec/data-model/message.dtd
deleted file mode 100644
index bc51dd1590..0000000000
--- a/spec/data-model/message.dtd
+++ /dev/null
@@ -1,43 +0,0 @@
-<!ELEMENT message (
-  (declaration)*,
-  (pattern | (selectors,variant+))
-)>
-
-<!-- In a <declaration type="input">, the <expression> MUST contain a <variable> -->
-<!ELEMENT declaration (expression)>
-<!ATTLIST declaration
-  type (input | local) #REQUIRED
-  name NMTOKEN #REQUIRED
->
-
-<!ELEMENT selectors (variable)+>
-<!ELEMENT variant (key+,pattern)>
-<!ELEMENT key (#PCDATA)>
-<!ATTLIST key catchall (true | false) "false">
-
-<!ELEMENT pattern (#PCDATA | expression | markup)*>
-
-<!ELEMENT expression (
-  ((literal | variable), function?, attribute*) |
-  (function, attribute*)
-)>
-
-<!ELEMENT literal (#PCDATA)>
-
-<!ELEMENT variable (EMPTY)>
-<!ATTLIST variable name NMTOKEN #REQUIRED>
-
-<!ELEMENT function (option)*>
-<!ATTLIST function name NMTOKEN #REQUIRED>
-
-<!ELEMENT option (literal | variable)>
-<!ATTLIST option name NMTOKEN #REQUIRED>
-
-<!ELEMENT attribute (literal)?>
-<!ATTLIST attribute name NMTOKEN #REQUIRED>
-
-<!ELEMENT markup (option*, attribute*)>
-<!ATTLIST markup
-  kind (open | standalone | close) #REQUIRED
-  name NMTOKEN #REQUIRED
->
diff --git a/spec/intro.md b/spec/intro.md
index 24a272ea66..3be5175ffc 100644
--- a/spec/intro.md
+++ b/spec/intro.md
@@ -12,7 +12,7 @@
 1. [Errors](errors.md)
 1. [Default Function Registry](functions/README.md)
 1. [`u:` Namespace](u-namespace.md)
-1. [Interchange data model](data-model/README.md)
+1. [Interchange Data Model](data-model/README.md)
 1. [Appendices](appendices.md)
    1. [Security Considerations](appendices.md#security-considerations)
    1. [Acknowledgements](appendices.md#acknowledgements)