Disable MathML support for DITA 1.3

MathML is enabled by default in DITA 1.3. If you do not need MathML, you can disable it.

Check out and open CompanyDitabase.dtd.
Scroll to the MathML Integration within the DOMAIN ENTITY DECLARATIONS section.

Comment out both entities as shown:

<!--<!ENTITY % mathml-d-dec 
  PUBLIC "-//OASIS//ENTITIES DITA 1.3 MathML Domain//EN" 
         "../../org.oasis-open.dita.v1_3/dtd/technicalContent/dtd/mathmlDomain.ent"
>%mathml-d-dec;

<!ENTITY % equation-d-dec 
  PUBLIC "-//OASIS//ENTITIES DITA 1.3 Equation Domain//EN" 
         "../../org.oasis-open.dita.v1_3/dtd/technicalContent/dtd/equationDomain.ent"
>%equation-d-dec;-->

In the DOMAIN EXTENSIONS section, delete the MathML-related extensions as follows:

<!ENTITY % ph           "ph | 
                         %hi-d-ph; | 
                         %pr-d-ph; | 
                         %sw-d-ph; | 
                         %ui-d-ph; |
                         %equation-d-ph;
                        ">                    
<!ENTITY % fig          "fig | 
                         %pr-d-fig; | 
                         %ut-d-fig; |
                         %equation-d-fig;
                        ">

<!ENTITY % foreign      "foreign | 
                         %mathml-d-foreign; |

                         %svg-d-foreign;
                        ">
<!ENTITY % div          "div | 
                         %equation-d-div;

                        ">

Note: In the ph and fig entities, be sure to delete the last | as well.

Scroll forward to the DOMAINS ATTRIBUTE OVERRIDE section.

Delete the &mathml-d-att; and &equation-d-att; domains as shown:

<!ENTITY included-domains 
                          "&concept-att;
                           &reference-att;
                           &task-att;
                           &glossentry-att;                          
                           ...
                           &localization-loc-d-att;  
                           &mathml-d-att;

                           &equation-d-att;                                                   
                          "
>

Scroll forward to the MathML Integration section within the DOMAIN ELEMENT INTEGRATION section.

Comment out both entities as shown:

<!--<!ENTITY % equation-d-def 
  PUBLIC "-//OASIS//ELEMENTS DITA 1.3 Equation Domain//EN" 
         "../../org.oasis-open.dita.v1_3/dtd/technicalContent/dtd/equationDomain.mod"
>%equation-d-def;

<!ENTITY % mathml-d-def 
  PUBLIC "-//OASIS//ELEMENTS DITA 1.3 MathML Domain//EN" 
         "../../org.oasis-open.dita.v1_3/dtd/technicalContent/dtd/mathmlDomain.mod"
>%mathml-d-def;-->

Save, close, and check in CompanyDitabase.dtd.