Question

1. The following XML document describes some employees of a company.

<?xml version="1.0" encoding="UTF-8"?>

<company>

<person age="25" id="p29432" manager="p48293">

<ssn>123456789</ssn>

<name> John Davis</name>

<office>B432</office>

<phone>1234</phone>

</person>

<person age="27" id="p29333" manager="p48222">

<ssn>987654321</ssn>

<name>Jim Handler</name>

<office>B123</office>

</person>

<person age=55 id="p29432" manager="p48221">

<ssn>123456789</ssn>

<name> Christo Dichev</name>

<office>A4210</office>

<phone>2477</phone>

</person>

<person age="57" id="p29333" manager="p4832">

<ssn>987654321</ssn>

<name>Elva Jones</name>

<office>A4211</office>

</person>

</company>

1. Check if the XML document is well-formed. If it is not, change it so that it becomes

wellformed, making as little changes as possible.

2. Write a DTD for this XML document such that the corrected version of the example is

a valid XML document.

Answer 1

1)

for <person age=55 id="p29432" manager="p48221">

age value 55 should be in double quotes that's the only change.. after that it is valid.

valid xml:

<?xml version="1.0" encoding="UTF-8"?>
<company>
   <person age="25" id="p29432" manager="p48293">
      <ssn>123456789</ssn>
      <name>John Davis</name>
      <office>B432</office>
      <phone>1234</phone>
   </person>
   <person age="27" id="p29333" manager="p48222">
      <ssn>987654321</ssn>
      <name>Jim Handler</name>
      <office>B123</office>
   </person>
   <person age="55" id="p29432" manager="p48221">
      <ssn>123456789</ssn>
      <name>Christo Dichev</name>
      <office>A4210</office>
      <phone>2477</phone>
   </person>
   <person age="57" id="p29333" manager="p4832">
      <ssn>987654321</ssn>
      <name>Elva Jones</name>
      <office>A4211</office>
   </person>
</company>

2)

dtd:

<?xml encoding="UTF-8"?>

<!ELEMENT company (person)+>
<!ATTLIST company
xmlns CDATA #FIXED ''>

<!ELEMENT person (ssn,name,office,phone?)>
<!ATTLIST person
xmlns CDATA #FIXED ''
age CDATA #REQUIRED
id NMTOKEN #REQUIRED
manager NMTOKEN #REQUIRED>

<!ELEMENT ssn (#PCDATA)>
<!ATTLIST ssn
xmlns CDATA #FIXED ''>

<!ELEMENT name (#PCDATA)>
<!ATTLIST name
xmlns CDATA #FIXED ''>

<!ELEMENT office (#PCDATA)>
<!ATTLIST office
xmlns CDATA #FIXED ''>

<!ELEMENT phone (#PCDATA)>
<!ATTLIST phone
xmlns CDATA #FIXED ''>