Github user 1ambda commented on the issue:
https://github.com/apache/zeppelin/pull/1384
@felixcheung
Pegdown doesn't support YUML, Websequence and Include plugins according to
[Pegdown
Extensions](https://github.com/sirthias/pegdown/blob/master/src/main/java/org/pegdown/Extensions.java)
I think we have 2 options. (or more)
1. Use markdown4j and implement [table
plugins](https://github.com/jdcasey/markdown4j/blob/master/src/main/java/org/markdown4j/TablePlugin.java)
correctly.
** we might need small effort, but we will depend on markdown4j which is
not actively developed.
** and other markdown syntaxes might be implemented if necessary.
2. Use pegdown and implement
[YUML](https://github.com/billy1380/markdown4j-gwt/blob/master/src/main/java/org/markdown4j/YumlPlugin.java),
[Websequence](https://github.com/jdcasey/markdown4j/blob/master/src/main/java/org/markdown4j/WebSequencePlugin.java).
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