XML Entity Reference dialog box
Develop > XML > Entity Reference
Lets you insert an entity reference in an XML document.
To insert an entity reference, select an entity name from the drop-down menu. (Only entities that have been declared appear in the drop-down menu.) You can also type the entity name.
If you enter the name of an entity that hasn’t been declared, the entity reference will still be inserted, but an error will occur when you try to save the document or display it in a browser.