productid (Product Identifier) Attribute Description .email comment.
Description
This attribute holds a copy of the value in the same attribute on the <meta> element, and is only needed when a section of the article is extracted from the article, so that it can continue to carry this information.
In Shared Group
Defined in shared attribute group: "Section Attributes"
Specification
This attribute is not required. It has text content.
DTD Definition
The DTD contains the following attribute definition (note that embedded links are to definitions within the DTD page of this guide):
                productid                CDATA  #IMPLIED 
.