Semantic-Embedding-Examples.md

 Some simple examples of embedded semantic tree. Note that for readability the attributes of the MathML elements have been abbreviated. Usually they have a 'semantic-' prefix.
 
+```html
+<mi semantic-type="identifier" semantic-role="latinletter" semantic-id="1" semantic-parent="3">b</mi>
+```
+
+is shortened to 
+
+```html
+<mi type="identifier" role="latinletter" id="1" parent="3">b</mi>
+```
 
 ## Single Operation