(Swift 3,4,5...) XML Inclusive Canonicalization

Demonstrates how to convert XML to the Inclusive XML Canonicalization form as specified in http://www.w3.org/TR/xml-c14n/

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func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // The XML digital signature verification class provides utility methods for
    // XML canonicalization.  This example demonstrates how to do inclusive XML canonicalization.

    let http = CkoHttp()!
    let sbXml = CkoStringBuilder()!
    let canon = CkoXmlDSig()!

    // Use inclusive XML canonicalization.
    var canonVersion: String? = "C14N"
    var withComments: Bool = false

    var url: String? = "https://www.chilkatsoft.com/exampleData/c14n/test7.xml"
    var success: Bool = http.quickGetSb(url, sbContent: sbXml)

    // This is the input XML:
    // The XML comment is referring to when exclusive XML canonicalization is applied.  With inclusive canonicalization, the namespace nodes
    // are kept, as we'll see below..

    // <doc>
    // <!-- A namespace node N is ignored if the nearest ancestor element of the node's parent element that is in the node-set has a namespace node in the node-set with the same local name and value as N. -->
    // 	<animal xmlns:aa="https://www.animal.com/">
    // 		<reptile xmlns:bb="https://www.reptile.com/">
    //   			<lizard xmlns="" type="african fat tailed" abc="xyz" xmlns:aa="https://www.animal.com/" />
    //   			<snake type="poisonous rattler" xmlns:bb="https://www.reptile.com/" >
    //   			</snake>
    //   		</reptile>
    //   	</animal>
    // </doc>

    var xmlInclCanon: String? = canon.canonicalizeXml(sbXml.getAsString(), version: canonVersion, withComments: withComments)
    print("\(xmlInclCanon!)")

    // The C14N (inclusive) canonicalization is:

    // <doc>
    // 
    // 	<animal xmlns:aa="https://www.animal.com/">
    // 		<reptile xmlns:bb="https://www.reptile.com/">
    //   			<lizard abc="xyz" type="african fat tailed"></lizard>
    //   			<snake type="poisonous rattler">
    //   			</snake>
    //   		</reptile>
    //   	</animal>
    // </doc>

    // To see the difference, let's do exclusive canonicalization..
    canonVersion = "EXCL_C14N"

    var xmlExclCanon: String? = canon.canonicalizeXml(sbXml.getAsString(), version: canonVersion, withComments: withComments)
    print("\(xmlExclCanon!)")

    // // The C14N (exclusive) canonicalization is:
    // 
    // <doc>
    // 
    // 	<animal>
    // 		<reptile>
    //   			<lizard abc="xyz" type="african fat tailed"></lizard>
    //   			<snake type="poisonous rattler">
    //   			</snake>
    //   		</reptile>
    //   	</animal>
    // </doc>

}