CLDR-17505 Fix blocking items (#4048)

Co-authored-by: Steven R. Loomis <[email protected]>

docs/ldml/tr35.md

@@ -1932,7 +1932,21 @@ The following describes in more detail how to determine the exact inheritance of
 
 #### <a name="Definitions" href="#Definitions">Definitions</a>
 
-_Blocking_ elements are those whose subelements do not inherit from parent locales. For example, a `<collation>` element is a blocking element: everything in a `<collation>` element is treated as a single lump of data, as far as inheritance is concerned. For more information, see [Valid Attribute Values](#Valid_Attribute_Values).
+_Ordered_ elements are those whose sequence in the XML file is important; that is, changing the order of those elements can make a difference in the interpretation of the data. These are marked with the `@ORDRED` annotation in the dtd file. For example, consider the following in `ldmlSupplemental.dtd`:
+```
+<!ELEMENT languageMatch EMPTY >
+    <!--@ORDERED-->
+```
+In the file `languageInfo.xml`, we find the following.
+```
+<languageMatch desired="ja_Hira"	supported="ja_Jpan"	distance="5"	oneway="true"/>
+…
+<!-- default script mismatch distance -->
+<languageMatch desired="*_*"	supported="*_*"	distance="50"/>	<!-- *; * ⇒ *; * -->
+```
+The ordering among the `languageMatch` items is important, because the `*_*` must only be matched _after_ all the explicit scripts have been.
+
+The ordered elements also _block_ inheritance in files governed by `ldml.dtd`. That is, because the elements are ordered, there is no way to tell where an inherited element from a parent locale would be in that sequence.
 
 Attributes that serve to distinguish multiple elements at the same level are called _distinguishing_ attributes. For example, the `type` attribute distinguishes different elements in lists of translations, such as: