Step 2-4. Declare FAQ Question Topic Type Elements and Attributes

Per our markup design from step 1, we will need to declare the following specialized element types:
To create these new element types, edit the faq-question.mod file and modify it as follows:
  1. Find the declaration for the <concept> element type. Change "concept" to "faq-question" in the element and attribute list declarations.
  2. Within the content model for what is now <faq-question>, change "%title;" to "%faq-question-statement;" and "%conbody;" to "%faq-answer;".
  3. Find the declaration for the <conbody> element type. Change "conbody" to "faq-answer" in the element and attribute list declarations.
  4. From the base DITA distribution, open commenElements.mod and find the declaration for the <title> element. Copy this declaration and paste it into faq-question.mod. Change "title" to "faq-question-statement" in the element and attribute list declarations.
The element type declarations should look like this:
  
<!--                    LONG NAME: FAQ question  -->
<!ENTITY % faq-question.content
 "
  ((%faq-question-statement;), 
   (%titlealts;)?,
   (%prolog;)?, 
   (%faq-answer;)?, 
   (%related-links;)?,
   (%faq-question-info-types;)* )                   
">
<!ENTITY % faq-question.attributes
'
             id         ID                               #REQUIRED
             conref     CDATA                            #IMPLIED
             %select-atts;
             %localization-atts;
             %arch-atts;
             outputclass 
                        CDATA                            #IMPLIED
             domains    CDATA                "&included-domains;"    
'>
<!ELEMENT faq-question %faq-question.content; >
<!ATTLIST faq-question %faq-question.attributes; > 


<!--                    LONG NAME: FAQ answer details -->
<!ENTITY % faq-answer.content
"
  ((%body.cnt;)*, 
   (%section;|
    %example;)* 
  )     
">
<!ENTITY % faq-answer.attributes
'
             %id-atts;
             %localization-atts;
             outputclass 
                        CDATA                            #IMPLIED    
'>
<!ELEMENT faq-answer %faq-answer.content; >
<!ATTLIST faq-answer %faq-answer.attributes; > 
             
<!--                    LONG NAME: FAQ question statement -->

<!ENTITY % faq-question-statement.content
"
  (%title.cnt;)*                               
"> 
<!ENTITY % faq-question-statement.attributes
'
             %id-atts;
             %localization-atts;
             outputclass 
                        CDATA                            #IMPLIED    
'>
<!ELEMENT faq-question-statement %faq-question-statement.content; >
<!ATTLIST faq-question-statement %faq-question-statement.attributes; > 

If you want, validate the test document again. You should now only get "parameter entity 'question-statement' was referenced but not declared" sorts of errors (and maybe some errors about the declaration of <faq-question> itself). This indicates we've declared the necessary element types, at least minimally, but we need to declare the parameter entities as well.