I need some help, making sure I understand this and doing it right.
The element rit
1.1. The element rit has an attribute version that must have the value 1.0
1.2. The element rit has a required attribute date that has a text representing the date of feed.
1.3. The element rit can have 0 or more feed elements
1.4. The element rit’s last element is a required doc-copyright element. The copyright statement for your company.
<!ELEMENT rit (version, date, feed*, doc-copyright) >
<!ATTLIST ret version CDATA #FIXED "1.0">
<!ATTLIST ret date CDATA #REQUIRED >
Thank you.
If version and date are attributes, they shouldn't be in the content model of the rit element declaration (remove them from (version, date, feed*, doc-copyright)).
Don't forget to add element declarations for the date and doc-copyright elements.
Having multiple ATTLIST declarations for an element is ok, but in my opinion it's easier to read and maintain a single ATTLIST for an element.
Example of changes...
<!ELEMENT rit (feed*, doc-copyright)>
<!ATTLIST ret
version CDATA #FIXED "1.0"
date CDATA #REQUIRED >
<!ELEMENT feed (#PCDATA)>
<!ELEMENT doc-copyright (#PCDATA)>