Chunking mapref content to single HTML without modifying child map

[malgorb]

Hi all,

I have a submap that publishes to PDF successfully:

<map id="submap1">
    <title>Submap 1</title>
    <topicref href="chapter1_intro.dita">
        <topicref href="topic1a.dita"/>
        <topicref href="topic1b.dita"/>
    </topicref>
    <topicref href="chapter2_intro.dita">
        <topicref href="topic2a.dita"/>
    </topicref>
</map>

I need to reference this submap from a parent map and publish the submap content as a single HTML page:

<map id="parentmap">
    <title>Parent Map</title>
    <mapref href="submap1.ditamap"/>
    <mapref href="submap2.ditamap"/>
</map>

Constraint 1: I cannot modify the submap structure (it's shared with PDF output).
Constraint 2: I cannot have separate submaps - one for PDF output and another for HTML.

Goal: When parent map is published to HTML, each submap becomes one HTML page.

Using DITA-OT 3.7.4 with DITA 1.3, I tried:

1. <mapref href="submap1.ditamap" chunk="to-content"/>
2. <topichead navtitle="Section 1" chunk="to-content"><mapref .../></topichead>
3. <topicref navtitle="Section 1" chunk="to-content"><mapref .../></topicref>
4. <topicref navtitle="Section 1" chunk="to-content" href="overview.dita"><mapref .../></topicref>

None produced the expected single-page output. Instead, I got a lot of chunk-related errors and missing content. For example:

Is there a supported way to chunk mapref content into a single file without modifying the child map? Like I said, I tried DITA-OT 3.7.4 with DITA 1.3 but I'm open to trying other DITA-OT and DITA spec versions.

[robander]

The Chunk234242 style naming usually comes when you have the same file name chunked more than once -- for example, if your fourth option above used href="overview.dita" for each of the branches.

If that's not the case, I'm really surprised that the fourth method at least did not work. I cannot remember if we ever had support for putting chunk="to-content" directly on the mapref, I can clearly understand the markup but the processing would be weird as we usually throw away that intermediate mapref.

The 3.7.4 release isn't that old, all things considered, but it's worth trying with the most recent stable release. With the most recent release, you could also try using DITA 2.0 if you have time to play around more, in that case the chunk value would switch to chunk="combine" and it would go through the new DITA 2.0 chunk processing.