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custom tags doubt

 
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<my:simpleTag>
<my:complexTag />
</my:simpleTag>

this was given in HFS as true
my doubt how can a classic tag can have a simpletag parent? it is not allowed right?
 
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Sure it is. It's the entire reason for the TagAdapter class - it wraps the SimpleTag parent so it looks like a Tag parent. With its getAdaptee() method you get the actual SimpleTag (as a JspTag).
 
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