Returns the list of CrawlableDatasets contained in this collection dataset. The returned list will be empty if this collection dataset does not contain any children datasets. If this dataset is not a collection dataset, this method returns null.
@return Returns a list of the CrawlableDatasets contained in this collection dataset.The llist will be empty if no datasets are contained in this collection dataset.
@throws IOException if an I/O error occurs while accessing the children datasets.
@throws IllegalStateException if this dataset is not a collection, the isCollection() method should be used to check.
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