IIOMetadataNodepublic interface NodeList
NodeList interface provides the abstraction of an ordered collection of nodes, without defining or constraining how this collection is implemented. NodeList objects in the DOM are live. The items in the NodeList are accessible via an integral index, starting from 0. 
See also the Document Object Model (DOM) Level 3 Core Specification.
Node item(int index)
indexth item in the collection. If index is greater than or equal to the number of nodes in the list, this returns null.index - Index into the collection.indexth position in the NodeList, or null if that is not a valid index.int getLength()
length-1 inclusive.
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    https://docs.oracle.com/en/java/javase/21/docs/api/java.xml/org/w3c/dom/NodeList.html