Which of the following is TRUE only of XML but NOT HTML?

Consider the XML document fragment given below:

Consider the XPath expression: *[not (self)::TOC]
What would be the result of the given XPath expression when the current node is Book?

Consider the following XML DTD describing course information in a university:

<!ELEMENT Univ (Course+, Prof+)>
<!ELEMENT Course (Title, Eval*)>
<!ATTLIST Course Number ID #REQUIRED Instructor IDREF #IMPLIED>
<!ELEMENT Title (#PCDATA)>
<!ELEMENT Eval (#PCDATA)>
<!ATTLIST Eval Score CDATA #REQUIRED>
<!ELEMENT Prof EMPTY>
<!ATTLIST Prof Name ID #REQUIRED Teaches IDREF #IMPLIED>

What is returned by the following XQuery?

let $as := //@Score
for $c in /Univ/Course[Eval]
let $cs := $c/Eval?@Score
where min($cs) > avg($as)
return $c 

A HTML form is to be designed to enable purchase of office stationery. Required items are to be selected (checked). Credit card details are to be entered and then the submit button is to be pressed. Which one of the following options would be appropriate for sending the data to the server. Assume that security is handled in a way that is transparent to the form design.

Given below is an excerpt of an xml specification.

Given below are several possible excerpts from "library.dtd". For which excerpt would the above specification be valid?

Consider an XML file called intro.xml and a document type defintion (DTD) file intro.dtd as follows:

A validating parser will classify intro.xml as

Given below are several usages of the anchor tag in HTML.

Which of the above are valid?