PPTX parsing: bullet points not grouped correctly under subheadings

[harskuma]

While working with PPTX files, I came across a formatting issue that could use some enhancement. Specifically, when a slide contains multiple subheadings, each with their own bullet points, the parsed output doesn’t maintain the correct grouping of bullet points under their respective subheadings.
current version : Docling 2.28.4

For example, consider a slide like this:

Currently, the extracted output looks like this:

As shown in the attached screenshot, all bullet points are getting grouped under the first subheading, and the second subheading appears without its associated content.

Suggested Enhancement:
It would be helpful to enhance the PPTX parsing logic to:

• Maintain bullet point association with the correct subheading
• Possibly use text box position, text style, or slide structure hierarchy to infer grouping

[happyiminjay1]

not only bullet points but all the indent makes it weird...

[ceberam]

@harskuma @happyiminjay1 The pptx format doesn't have the same built-in heading and subheading "styles" as docx, which makes it a bit challenging. In addition, there is the issue of the reading order pointed out at #2097. The PR #1658 may have solved the example from @harskuma .
However, I made a quick and easy test with the file below and I saw no bullet point, so I am wondering if there are some issues in the hierarchical parsing of the pptx backend. I will create an issue from this discussion.

# Open-Source Software

Key Benefits:

Open-source software is cost-effective as it eliminates license fees, reducing overall expenses.

Ehnhances security and transparency by allowing public access to source code

Strong global community improves and maintains open-source projects.

Offers flexibility, allowing users to customize and adapt the software

Considerations When Using Open-Source Software:

Open-source projects often rely on community support, which may not be as reliable as dedicated customer service.

Some open-source solutions may require advanced technical expertise for implementation and maintenance.

Sample-discussion-1323.pptx