DITA DTD constraint for table and figure

Question

Can anyone help me create DITA DTD constraints?

I want to create Constraints for figure, image and table.
Image tag with alt tag mandatroy
I want the figure title to also be mandatory, while table title, desc, and thead with at least one entry.

score 1 · Answer 1 · answered Mar 25 '14 at 06:29

1

Create imageConstraints.mod:

<!ENTITY altReq-constraint 
  "(topic altReq-c)">

<!ENTITY % image.content
                       "((%alt;),
                         (%longdescref;)?)">

Then include it into your shell DTD with something like

<!ENTITY % altReq-c-def  
  PUBLIC "-//FOO//ELEMENTS DITA 1.2 Required Alt Constraint//EN" 
  "imageConstraint.mod">
%altReq-c-def;

and add it the included-domains entity

<!ENTITY included-domains "...
                           &altReq-constraints;">

Figure and table follow the same pattern.

You can't force the at least one table header entry rule with DTDs, for that you need to use e.g. Schematron.

answered Mar 25 '14 at 06:29

jelovirt

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Thank!..i am getting some complication in figure and table constraints. In figure and table several othere elements are there. do i need to declare all elements and entity in constraints? – user3165851 Mar 26 '14 at 06:41
Yes, you need to add the elements you want into `fig` and `table`, there is no shortcut to just make them mandatory. – jelovirt Mar 27 '14 at 17:28

score 0 · Answer 2 · answered Mar 24 '14 at 16:19

My DTD knowledge is a bit rusty, but I believe if you are modifying the DTD and the element is optional it will have a question mark next to it

<!ELEMENT title (#PCDATA )>
<!ELEMENT figure (title?) >

To make is title required, remove the ?:

<!ELEMENT title (#PCDATA )>
<!ELEMENT figure (title) >

DITA DTD constraint for table and figure

2 Answers2