Merge pull request #230628 from eric-urban/eur/ssml-update

special chars

Author: prmerger-automator[bot]

articles/cognitive-services/Speech-Service/speech-synthesis-markup-structure.md

@@ -75,9 +75,23 @@ Some examples of contents that are allowed in each element are described in the
 
 The Speech service automatically handles punctuation as appropriate, such as pausing after a period, or using the correct intonation when a sentence ends with a question mark.
 
+## Special characters
+
+To use the characters `&`, `<`, and `>` within the SSML element's value or text, you must use the entity format. Specifically you must use `&amp;` in place of `&`, `&lt;` use in place of `<`, and use `&gt;` in place of `>`. Otherwise the SSML will not be parsed correctly. 
+
+For example, specify `green &amp; yellow` instead of `green & yellow`. The following SSML will be parsed as expected:
+
+```xml
+<speak version="1.0" xmlns="http://www.w3.org/2001/10/synthesis" xml:lang="en-US">
+    <voice name="en-US-JennyNeural">
+        My favorite colors are green &amp; yellow.
+    </voice>
+</speak>
+```
+
 Special characters such as quotation marks, apostrophes, and brackets, must be escaped. For more information, see [Extensible Markup Language (XML) 1.0: Appendix D](https://www.w3.org/TR/xml/#sec-entexpand).
 
-Attribute values must be enclosed by double quotation marks. For example, `<prosody volume="90">` is a well-formed, valid element, but `<prosody volume=90>` won't be recognized. 
+Attribute values must be enclosed by double or single quotation marks. For example, `<prosody volume="90">` and `<prosody volume='90'>` are well-formed, valid elements, but `<prosody volume=90>` won't be recognized. 
 
 ## Speak root element