XML Demysti ed in Java

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XML Demysti ed
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The DeleteNodes() Function
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The DeleteNodes() function removes a specific node from the XML document Here s the DeleteNodes() function You ll notice that it requires one argument, which is the UPC code of the CD that is to be deleted from the XML document
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function DeleteNodes(upc) { var objNodes = objXMLselectNodes( "/catalog/cd[@upc='" + upc + "']"); if(objNodeslength == 0) { alert("Could not find node with upc " + upc); return; } for(var i=0; i < objNodeslength; i++) { objXMLdocumentElementremoveChild(objNodesitem(i)); } documentall("xmlresult")value = objXMLxml; }
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The first line calls the selectNodes() method and passes it the XPath expression that s used to locate elements whose upc attribute matches the CD UPC the user enters The selectNodes() method returns a collection containing those elements The second line uses an if statement to evaluate if a CD matched the UPC If not, then the length property is zero, the alert message is displayed, and the function returns without deleting any information from the XML document The third line executes only if there are elements to be deleted It uses a for loop to step through the collection and calls the removeChild() method to remove the element The fourth line executes once the final element is deleted This line displays the results we show here:
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< xml version="10" > <!DOCTYPE catalog SYSTEM "catalogdtd"> <catalog> <cd upc="602498678299"> <artist>U2</artist> <title>How to Dismantle an Atomic Bomb</title> <price>1398</price> <label>Interscope Records</label> <date>2004-11-23</date> </cd>
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CHAPTER 10 MSXML
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<cd upc="75679244222"> <artist>Led Zeppelin</artist> <title>Physical Graffiti</title> <price>2299</price> <label>Atlantic</label> <date>1994-08-16</date> </cd> <cd upc="74646938720"> <artist>Billy Joel</artist> <title>Songs in the Attic</title> <price>1099</price> <label>Sony</label> <date>1998-10-20</date> </cd> <cd upc="75678263927"> <artist>Led Zeppelin</artist> <title>Houses of the Holy</title> <price>1098</price> <label>Atlantic</label> <date>1994-07-19</date> </cd> <cd upc="8811160227"> <artist>Jimi Hendrix</artist> <title>Are You Experienced </title> <price>1299</price> <label>Experience Hendrix</label> <date>1997-04-22</date> </cd> <cd upc="74640890529"> <artist>Bob Dylan</artist> <title>The Times They Are A-Changin'</title> <price>999</price> <label>Sony</label> <date>1990-10-25</date> </cd> </catalog>
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The ValidateDocument() Function
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You use the ValidateDocument() function to validate an XML document against the document s DTD to determine if all elements in the XML document are defined in the DTD Here s the ValidateDocument() function Notice that this is one of the simplest
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XML Demysti ed
functions that you can build It simply calls the validate() method and then evaluates the return value If the returned errorCode is zero, then the XML document is valid If the errorCode is other than zero, then the XML doesn t comply with the DTD
function ValidateDocument() { var err = objXMLvalidate(); if (errerrorCode == 0) { alert("Document is valid"); } else { alert("Error validating document:" + errreason); } }
To test this function, return to the InsertFirst() function at the beginning of this chapter Change the value of the new CD element in the text area of the HTML page to the following Notice that the price element is deleted This is required by the DTD
<cd upc="75596280822"> <artist>Phish</artist> <title>Live Phish, Vol 15</title> <label>ELEKTRA/WEA</label> <date>2002-10-29</date> </cd>
Click the InsertFirst() hyperlink and the XML document will look like this Notice that price is missing, making the XML document invalid according to the DTD
< xml version="10" > <!DOCTYPE catalog SYSTEM "catalogdtd"> <catalog> <cd upc="75596280822"> <artist>Phish</artist> <title>Live Phish, Vol 15</title> <label>ELEKTRA/WEA</label> <date>2002-10-29</date> </cd> <cd upc="602498678299"> <artist>U2</artist> <title>How to Dismantle an Atomic Bomb</title> <price>1398</price> <label>Interscope Records</label> <date>2004-11-23</date>
CHAPTER 10 MSXML
</cd> <cd upc="75679244222"> <artist>Led Zeppelin</artist> <title>Physical Graffiti</title> <price>2299</price> <label>Atlantic</label> <date>1994-08-16</date> </cd> <cd upc="75678367229"> <artist>Rush</artist> <title>Rush in Rio</title> <price>1398</price> <label>Atlantic</label> <date>2003-10-21</date> </cd> <cd upc="74646938720"> <artist>Billy Joel</artist> <title>Songs in the Attic</title> <price>1099</price> <label>Sony</label> <date>1998-10-20</date> </cd> <cd upc="75678263927"> <artist>Led Zeppelin</artist> <title>Houses of the Holy</title> <price>1098</price> <label>Atlantic</label> <date>1994-07-19</date> </cd> <cd upc="8811160227"> <artist>Jimi Hendrix</artist> <title>Are You Experienced </title> <price>1299</price> <label>Experience Hendrix</label> <date>1997-04-22</date> </cd> <cd upc="74640890529"> <artist>Bob Dylan</artist> <title>The Times They Are A-Changin'</title> <price>999</price> <label>Sony</label> <date>1990-10-25</date> </cd> </catalog>
XML Demysti ed
The DOMDocument object doesn t automatically revalidate the XML document each time it s altered, so no error message is displayed Now select the Validate Document link on the HTML page The ValidateDocument() function validates the XML document and displays an alert message indicating that the XML Document is invalid The alert message is something like: Error validating document: Element content is invalid according to the DTD/ Schema Expecting: price This is telling you that the price element was expected
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