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(Xojo Plugin) XML Tree Traversal Order for Search* Methods

The Chilkat XML API provides a number of Search* methods for locating XML nodes based on criteria. These methods traverse an XML document in a breadth-first order. (See Breadth-First Search).

The XML document used in this example has the following tree structure:

The nodes are traversed in the order: A, B, C, D, E, F, G, H, I, J, K.

The input XML, available at http://www.chilkatsoft.com/data/searchOrder.xml, is this:

<a>crocodileA
    <b>crocodileB
        <d>crocodileD</d>
        <e>crocodileE
            <h>crocodileH</h>
            <i>crocodileI</i>
        </e>
    </b>
    <c>crocodileC
        <f>crocodileF</f>
        <g>crocodileG
            <j>crocodileJ</j>
            <k>crocodileK</k>
        </g>
    </c>
</a>

Chilkat Xojo Plugin Download

Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

Dim xml As New Chilkat.Xml
Dim xBeginAfter As Chilkat.Xml
Dim xFound As Chilkat.Xml

Dim success As Boolean
// The sample input XML is available at http://www.chilkatsoft.com/data/searchOrder.xml
success = xml.LoadXmlFile("searchOrder.xml")
If (success <> True) Then
    System.DebugLog(xml.LastErrorText)
    Return
End If

// IMPORTANT:  The following loop for iterating over all 
// matching nodes performs reasonably well for small to 
// mid-size XML documents or sub-trees.  Performance
// can be poor when the sub-tree contains many thousands
// of nodes (or more).

// NOTE:  The search is always rooted at the calling node.
// In this example, it happens to also be the root node of the entire
// XML document.  Searches can be performed on sub-trees
// within the document by calling the Search* method from
// the root node of a sub-tree.

// Demonstrate the breadth-first traversal:
xBeginAfter = xml.GetSelf()
xFound = xml.SearchAllForContent(xBeginAfter,"*croc*")
While (xml.LastMethodSuccess = True)

    System.DebugLog(xFound.Tag)

    xBeginAfter = xFound
    xFound = xml.SearchAllForContent(xBeginAfter,"*croc*")
Wend


 

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