Is it valid to use dtd entities in defining XML ids?

I'm reviewing some code for a dialog in Address book and need some guidance.

The submitter has defined an id in the xml for the dialog as:

<textbox id="Home&StateAndZipCodeLeft.id;">

In the DTD it is defined as:

<!ENTITY StateAndZipCodeLeft.id         "State">

Is this valid?

In the specification I have been pointed to 
(http://www.w3.org/TR/REC-xml/#sec-attribute-types) says the following:

"Values of type ID MUST match the Name production."

Name is defined as

Name       ::=          (Letter | '_' | ':') (NameChar)*

The submitter has since pointed out the text :

The Names and Nmtokens productions are used to define the validity of 
tokenized attribute values after normalization (see 3.3.1 Attribute Types).

How I read that section implies that the id as defined above is valid.

Please can someone with more knowledge just confirm this for me?

Thanks
Standard8