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XPath exercises answers

1. Path expressions

  • Write an absolute path that finds all speech elements

/TEI/text/body/div/div/sp

  • Write an absolute path that finds all 'role' attribute values in the cast list

/TEI/text/front/div/castList/castItem/@type

  • Write a relative path that finds all speaker elements

//speaker

  • Write an relative path that finds all who attributes

//@who

2. Axis expressions

  • Write an axis expression that finds all sibling elements of second-level divs

//div/div[self::* or following-sibling::div]

  • Write an axis expression that finds all parent nodes of stage elements

//stage/parent::*

  • Write an axis expression that finds all speeches that come before or after a Hamlet speech.

//sp[@who="Hamlet"]/following-sibling::sp[1] | preceding-sibling::sp[1]

3. Predicates

  • Find all speech elements for all speakers except Hamlet

//sp[not(@who='Hamlet')]

  • Find all speech elements by Hamlet and Ophelia

//sp[@who='Hamlet'] | //sp[@who='Ophelia'] or //sp[@who=('Hamlet', 'Ophelia')]

  • Find the last line of each speech by Ophelia

//sp[@who='Ophelia']/l[last()]

4. Functions

  • Write a function to count speakers

count(//speaker)

  • Write a function to list only the distinct speakers (so a list of the speakers)

distinct-values(//speaker)

  • Write a function to return all lines in speeches that contain the string ‘Hamlet’, (except speaker elements)

//sp/l[contains(., 'Hamlet')]

  • Find the string length of each of Hamlet’s speeches.

//sp[@who='Hamlet']/l ! string-length(.)

  • Write a function to return all first lines of speeches greater than 100 characters

//l[1][string-length() gt 100]

  • Calculate the average character count of Hamlet’s speeches.

avg(//sp[@who='Hamlet']/l ! string-length(.))

  • List the distinct values of each speaker (i.e. list of characters) in Act 1

distinct-values(//body/div[1]//speaker)

XPath builder exercise

  • Use the previous expression to build a list separated by commas
//body/div[1]//speaker
=> distinct-values()
=> sort()
=> string-join(', ')
  • Write an XPath expression to list an alphabetised list of words spoken by Ophelia that came after ‘I’.
//sp[@who='Ophelia']/(l | ab)
[tokenize(.)[1] eq 'I']
/tokenize(.)[2]
=> distinct-values()
=> sort()