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Based on my research, the attributes ptType, cnt, and axis can each represent either a single value or a list of values.
With this in mind, it helps explain why scenarios such as axis="ch" can appear as a single value, or axis="ch ch" may represent a list of values within the same attribute.
To better interpret these values, I found the following documentation that may provide additional reference and context:
- Create Custom SmartArt Graphics For Use In The 2007 Office System | Microsoft Learn
- OOXML ptType - Complete documentation and samples
- OOXML draw-diag:ST_AxisTypes - Complete documentation and samples
- OOXML cnt - Complete documentation and samples
- OOXML draw-diag:forEach - Complete documentation and samples
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However, there should ideally be the latest official documentation that clearly explains this.
That said, I highly recommend sharing your feedback through Ideas · Community.
This is the official channel for submitting suggestions, and it ensures that your feedback reaches Microsoft’s development team, where it can help shape future updates and improve the overall experience.
I hope this brings some additional insight.
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