10.3 Exercises 259
parsing styles can help simplify the program, but all of them have disadvan-
tages. A better approach that has become very popular is to use the XML
Transformation Language that is introduced in the next chapter.
Summary
- Transformation from XML to XML using Perl can be done using any of
the parsing styles.
- None of the styles are completely satisfactory when the transformation
task is complicated.
10.3 Exercises
In the following exercises, write a Perl program that determines the specified
information. The solutions to these exercises are available online at the book
websiteontobio.org. Additional exercises are also available at this site.
- Using the health study database in section 1.1, find all interviews in the
year 2000 for which the study subject had a BMI greater than 30. Print the
information for each such interview using tab-delimited fields. Compare
your answer with your solution to exercise 10.1.
- Perform the same task as in exercise 10.1, but using a database in XML
format as in section 1.2. Write your program first by using patterns to
extract the information, and then by using the XML::Parser module.
- Generalize exercise 10.2 to extract interviews for any year and any mini-
mum BMI value. Write your program as a Perl procedure which has two
parameters.
- Given a BioML document as in figure 1.3, find all literature references
for the insulin gene. Compare your answer with your solution to exer-
cise 10.2.
- As in exercise 10.3, find all PubMed citations dealing with the therapeu-
tic use of glutethimide. For each citation print one line containing the
MedlineID, the title, and the date of publication in tab-delimited format.
