The horizontal axis of a waveform is _____.

Answer the following statements true (T) or false (F)

1) A DTD describes the contents of an XML document’s elements. 2) The schema specifies the type of data that elements and attributes may contain. 3) XML documents can reference optional documents that define how the XML documents should be structured. 4) Schemas are XML documents that conform to a DTD. 5) Extensible Stylesheet Language (XSL) is an XML vocabulary for formatting XHTML data

A priority queue can be implemented using

a) a list of queues b) a minheap c) a stack d) both a) and b) are correct e) all of a), b), and c) are correct