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Please make sure you have read the Tag Syntax document and understand how tag attribute syntax works.
Component for MergeIteratorTag, which job is to merge iterators and successive call to the merged iterator will cause each merge iterator to have a chance to expose its element, subsequently next call will allow the next iterator to expose its element. Once the last iterator is done exposing its element, the first iterator is allowed to do so again (unless it is exhausted of entries).
Internally the task are delegated to MergeIteratorFilter
Example if there are 3 lists being merged, each list have 3 entries, the following will be the logic.
Dynamic Attributes Allowed:false
|id||false||false||String||Deprecated. Use 'var' instead|
|var||false||false||String||The name where the resultant merged iterator will be stored in the stack's context|