For internal DTD XML
I created an internal DTD XML file, airportsDTD.xml, as follows:
And I executed the file in IE with positive result.
<?xml version=”1.0″ encoding=”UTF-8″ standalone=”yes”?>
<!DOCTYPE airports [
<!ELEMENT airports (airport+)>
<!ELEMENT airport (name, city, alt, lat, long, runway+) >
<!ATTLIST airport code CDATA #REQUIRED>
<!ELEMENT name (#PCDATA) >
<!ELEMENT city (#PCDATA) >
<!ELEMENT alt (#PCDATA) >
<!ELEMENT lat (#PCDATA) >
<!ELEMENT long (#PCDATA) >
<!ELEMENT runway (heading, length, width?) >
<!ATTLIST runway number (en1|en2|..) #REQUIRED>
<!ELEMENT heading (#PCDATA) >
<!ELEMENT length (#PCDATA) >
<!ELEMENT width (#PCDATA) >
]>
<airports>
<airport code=”AKL”>
<city>Auckland</city>
<name>Auckland International</name>
<runway number=”en1″>
<heading>05/23</heading>
<length>3,635m</length>
</runway>
</airport>
<airport code=”BKK”>
<city>Bangkok</city>
<name>Don Muang International</name>
<runway number=”en1″>
<heading>03L/21R</heading>
<length>3,700m</length>
</runway>
<runway number=”en2″>
<heading>03R/21L</heading>
<length>3,500m</length>
</runway>
</airport>
<airport code =”BOM”>
<city>Mumbai</city>
<name>Chhatarpati Shivaji</name>
<runway number =”en1″>
<heading>09/27</heading>
<length>3,489m</length>
</runway>
<runway number =”en2″>
<heading>14/32</heading>
<length>2,925m</length>
</runway>
</airport>
</airports>
For external DTD XML
As per instruction, I created 2 files, airport.dtd and airport.xml, with the coding as below. Then I saved them at the same directory as airport.py. Then I executed airport.py by IDLE with positive result.
Code of airport.dtd
<!ELEMENT airport (name, city, alt, lat, long, runway+) >
<!ATTLIST airport code CDATA #REQUIRED>
<!ELEMENT name (#PCDATA) >
<!ELEMENT city (#PCDATA) >
<!ELEMENT alt (#PCDATA) >
<!ELEMENT lat (#PCDATA) >
<!ELEMENT long (#PCDATA) >
<!ELEMENT runway (heading, length, width?) >
<!ATTLIST runway number (en1|en2|..) #IMPLIED >
<!ELEMENT heading (#PCDATA) >
<!ELEMENT length (#PCDATA) >
<!ELEMENT width (#PCDATA) >
Code of airport.xml
<?xml version=”1.0″ encoding=”iso-8859-1″ standalone=”no” ?>
<!DOCTYPE airports SYSTEM “airport.dtd”>
<airports>
<airport code=”AKL”>
<city>Auckland</city>
<name>Auckland International</name>
<alt>10</alt>
<lat>37 0’6″S</lat>
<long>174?7?9″E</long>
<runway number=”1″>
<heading>05/23</heading>
<length>3635</length>
<width>…</width>
</runway>
</airport>
<airport code=”BKK”>
<city>Bangkok</city>
<name>Don Muang International</name>
<alt>3</alt>
<lat>13 4’2″N</lat>
<long>100 6’0″E</long>
<runway number=”1″>
<heading>03L/21R</heading>
<length>3700</length>
<width>…</width>
</runway>
<runway number=”2″>
<heading>03R/21L</heading>
<length>3500</length>
<width>…</width>
</runway>
</airport>
<airport code=”HKG”>
<city>Hong Kong</city>
<name>Hong Kong</name>
<alt>6</alt>
<lat>22 18’32″N</lat>
<long>113 54’53″E</long>
<runway number=”1″>
<heading>07/25</heading>
<length>3800</length>
<width>…</width>
</runway>
<runway number=”2″>
<heading>07/25</heading>
<length>3800</length>
<width>…</width>
</runway>
</airport>
</airports>
Result:
Auckland
Auckland International
10
37 0’6″S
174?7?9″E
05/23
3635
…
Bangkok
Don Muang International
3
13 4’2″N
100 6’0″E
03L/21R
3700
…
03R/21L
3500
…
Hong Kong
Hong Kong
6
22 18’32″N
113 54’53″E
07/25
3800
…
07/25
3800
…
