(Tcl) Traverse Direct Children via FirstChild / NextSibling, or LastChild / PreviousSibling

Demonstrates some ways to iterate over direct child nodes using the FirstChild / NextSibling and LastChild / PreviousSibling methods.

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>

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load ./chilkat.dll

set xml [new_CkXml]

# child is a CkXml

# nextSibling is a CkXml

# prevSibling is a CkXml

set success [CkXml_LoadXmlFile $xml "qa_data/xml/fruit.xml"]
if {$success != 1} then {
    puts [CkXml_lastErrorText $xml]
    delete_CkXml $xml
    exit
}

# Iterate over the direct children by using FirstChild / NextSibling
set child [CkXml_FirstChild $xml]
set bContinue [CkXml_get_LastMethodSuccess $xml]
while {$bContinue == 1} {
    puts [CkXml_tag $child] : [CkXml_content $child]
    set nextSibling [CkXml_NextSibling $child]
    set bContinue [CkXml_get_LastMethodSuccess $child]
    delete_CkXml $child

    set child $nextSibling
}
puts "-----"

# Do the same, but with FirstChild2 / NextSibling2 to avoid
# creating so many XML object instances:
set success [CkXml_FirstChild2 $xml]
while {$success == 1} {
    puts [CkXml_tag $xml] : [CkXml_content $xml]
    set success [CkXml_NextSibling2 $xml]
}
# Revert back up to the parent:
set success [CkXml_GetParent2 $xml]

puts "-----"

# Iterate in reverse order using LastChild / PreviousSibling
set child [CkXml_LastChild $xml]
set bContinue [CkXml_get_LastMethodSuccess $xml]
while {$bContinue == 1} {
    puts [CkXml_tag $child] : [CkXml_content $child]
    set prevSibling [CkXml_PreviousSibling $child]
    set bContinue [CkXml_get_LastMethodSuccess $child]
    delete_CkXml $child

    set child $prevSibling
}
puts "-----"

# Do the same, but with LastChild2 / PreviousSibling2 to avoid
# creating so many XML object instances:
set success [CkXml_LastChild2 $xml]
while {$success == 1} {
    puts [CkXml_tag $xml] : [CkXml_content $xml]
    set success [CkXml_PreviousSibling2 $xml]
}
# Revert back up to the parent:
set success [CkXml_GetParent2 $xml]

delete_CkXml $xml