Xbase++

Removing / Deleting Child Nodes from XML

See more XML Examples

Demonstrates various methods for removing child nodes from an XML document.

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

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

Xbase++

LOCAL nSuccess
LOCAL oXml
LOCAL oXyz

nSuccess := 0

oXml := CreateObject("Chilkat.Xml")

//  The sample input XML is available at http://www.chilkatsoft.com/data/fruit.xml
nSuccess := oXml:LoadXmlFile("fruit.xml")
IF (nSuccess != 1)
    ? oXml:LastErrorText
    oXml:destroy()
    RETURN
ENDIF

//  The RemoveChild method removes (discards) all direct
//  children having the specified tag:
oXml:RemoveChild("fruit")

//  Show the resulting XML:
? 'Result with all direct children having a tag equal to "fruit" removed:'
? oXml:GetXml()

//  The XML with the "fruit" direct children removed is shown below:
//  Notice that the "fruit" node beneath "xyz" was not removed.
//  This correct because it was not a direct child of the calling node.

//  <root>
//      <veg color="orange">carrot</veg>
//      <meat animal="cow">beef</meat>
//      <xyz>
//          <fruit color="blue">blueberry</fruit>
//          <veg color="green">broccoli</veg>
//      </xyz>
//      <cheese color="yellow">cheddar</cheese>
//  </root>

//  --------------------------------------------------------------------------
//  Restore the original XML:
nSuccess := oXml:LoadXmlFile("fruit.xml")

//  The RemoveChildWithContent method removes the child
//  having the exact content specified, regardless of the tag.  
//  For example:
oXml:RemoveChildWithContent("pear")

//  Show the resulting XML:
? 'Result with the node containing "pear" removed:'
? oXml:GetXml()

//  --------------------------------------------------------------------------
//  Restore the original XML:
nSuccess := oXml:LoadXmlFile("fruit.xml")

//  The RemoveChildByIndex method removes the Nth direct
//  child.  Indexing begins at 0.  The "xyz" child is at index 4:
oXml:RemoveChildByIndex(4)

//  Show the resulting XML:
//  Notice that the entire "xyz" subtree is removed.
? "Result with the node at index 4 removed:"
? oXml:GetXml()

//  --------------------------------------------------------------------------
//  Restore the original XML:
nSuccess := oXml:LoadXmlFile("fruit.xml")

//  Navigate to the node with tag "xyz";
oXyz := oXml:FindChild("xyz")

//  Remove the "xyz" subtree making it it's own XML document
//  with the "xyz" node at the root:
oXyz:RemoveFromTree()

//  Show both XML documents:
? oXyz:GetXml()
? oXml:GetXml()

//  Also, the TreeId property is an integer value assigned
//  to nodes in an XML document.  All nodes belonging to
//  the same XML document will have the same TreeId.
//  Notice that the "xyz" node now has a different TreeId:
? "xyz TreeId = " + Str(oXyz:TreeId)
? "xml TreeId = " + Str(oXml:TreeId)

oXyz:destroy()

oXml:destroy()