This chapter is from the book
This chapter is from the book
This chapter is from the book
Workshop
This workshop tests whether you understand the concepts discussed today. It's a good idea to make sure you can answer these questions before pressing on to tomorrow's work. Answers to the quiz can be found in Appendix A, "Quiz Answers."
Quiz
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What's wrong with this XML document?
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Where do you see a problem with this XML document?
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What error is in this XML document?
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There's a problem in this XML document, too. What is it?
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What's wrong with this XML document?
<?xml version = "1.0" encoding="UTF-8" standalone="yes"?>
<!DOCTYPE document [
<!ELEMENT document (employee)*>
<!ELEMENT employee (hiredate, name)>
]>
<document>
<employee>
<hiredate>October 15, 2005</hiredate>
<name>
Grace Kelly
</name>
</employee>
</document>
<?xml version = "1.0" encoding="UTF-8" standalone="yes"?>
<!DOCTYPE document [
<!ELEMENT document (employee)*>
<!ELEMENT employee (name, hiredate)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT hiredate (#PCDATA)>
]>
<document>
<employee>
<hiredate>October 15, 2005</hiredate>
<name>
Grace Kelly
</name>
</employee>
</document>
<?xml version = "1.0" encoding="UTF-8" standalone="yes"?>
<!DOCTYPE document [
<!ELEMENT document (employee)*>
<!ELEMENT employee (hiredate+ | name+)>
<!ELEMENT hiredate (#PCDATA)>
<!ELEMENT name (#PCDATA)>
]>
<document>
<employee>
<hiredate>October 15, 2005</hiredate>
<name>
Grace Kelly
</name>
</employee>
</document>
<?xml version = "1.0" encoding="UTF-8" standalone="yes"?>
<!DOCTYPE document [
<!ELEMENT document (employee)?>
<!ELEMENT employee (hiredate+, name*, phone+)>
<!ELEMENT hiredate (#PCDATA)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT phone (#PCDATA)>
]>
<document>
<employee>
<hiredate>October 15, 2005</hiredate>
<name>
Grace Kelly
</name>
<phone>
555.8888
</phone>
</employee>
<employee>
<hiredate>October 16, 2005</hiredate>
<name>
Myrna Loy
</name>
<name>
Muriel Blandings
</name>
<phone>
555.9999
</phone>
</employee>
</document>
<?xml version = "1.0" encoding="UTF-8" standalone="yes"?>
<!DOCTYPE document SYSTEM "employee.dtd">
<document>
<employee>
<name>
Grace Kelly
</name>
<hiredate>October 15, 2005</hiredate>
</employee>
</document>
Exercises
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Create a new XML document that holds the names of your relatives by using elements such as <brother>, <sister>, <mother>, and <father>, as well as <name>, <age>, and <address> elements. Next, add a DTD to the document and use an XML validator such as the Scholarly Technology Group's XML validator, at http://www.stg.brown.edu/service/xmlvalid, to check whether your document is valid. Alternatively, add to the well-formed XML document you created in Exercise 1 at the end of yesterday's discussion a DTD that holds the available menu items and their prices at a favorite restaurant of yours.
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Convert the XML document you created in Exercise 1 to make the DTD external. If you can upload the external DTD file to a Web server and include its URI in the <!DOCTYPE> element (for example, <!DOCTYPE document SYSTEM "http://www.server.com/username/relatives.dtd">), use an online XML validator such as the Scholarly Technology Group's XML validator to check the new document's validity.