There is no relation between Obsidian an SiYuan.
SiYuan was born few months after Obsidian and is made by different developers in China.
As far as I know, SiYuan is also closed source. There are other differences, but I am not super familiar, so I suggest you ask in their forum for clarifications.
Again, there is no relationship and there won’t be any incorporation or exporting of features.
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