Attributes with namespace (Foundation on macOS)

attributes.swift

import Cocoa

let uriNs1 = "http://example.com/ns1"
let uriNs2 = "http://example.com/ns2"

let root = XMLNode.element(withName: "root") as! XMLElement
root.addNamespace(XMLNode.namespace(withName: "ns1", stringValue: uriNs1) as! XMLNode)

let element = XMLNode.element(withName: "element") as! XMLElement
element.addNamespace(XMLNode.namespace(withName: "ns2", stringValue: uriNs2) as! XMLNode)
root.addChild(element)

// Add attributes without URI
element.addAttribute(XMLNode.attribute(withName: "name", stringValue: "John") as! XMLNode)
element.addAttribute(XMLNode.attribute(withName: "ns1:name", stringValue: "Tom") as! XMLNode)

// Add attributes with URI
element.addAttribute(XMLNode.attribute(withName: "ns1:age", uri: uriNs1, stringValue: "44") as! XMLNode)
element.addAttribute(XMLNode.attribute(withName: "ns1:address", uri: uriNs2, stringValue: "Foobar City") as! XMLNode) // different namespace prefix
element.addAttribute(XMLNode.attribute(withName: "phone", uri: uriNs2, stringValue: "xxx-xxx") as! XMLNode) // no prefix

// Retrieve attributes without URI
element.attribute(forName: "name")              // name="John"
element.attribute(forName: "ns1:name")          // ns1:name="Tom"
element.attribute(forName: "ns1:age")           // ns1:age="44"
element.attribute(forName: "ns1:address")       // ns1:address="Foobar City"
element.attribute(forName: "ns2:address")       // ns1:address="Foobar City"
element.attribute(forName: "phone")             // phone="xxx-xxx"
element.attribute(forName: "ns2:phone")         // phone="xxx-xxx"

// Retrieve attributes with URI
element.attribute(forLocalName: "name", uri: nil)           // name="John"
element.attribute(forLocalName: "name", uri: uriNs1)        // ns1:name="Tom"
element.attribute(forLocalName: "age", uri: uriNs1)         // ns1:age="44"
element.attribute(forLocalName: "address", uri: uriNs1)     // nil
element.attribute(forLocalName: "address", uri: uriNs2)     // ns1:address="Foobar City"
element.attribute(forLocalName: "phone", uri: uriNs2)       // phone="xxx-xxx"
element.attribute(forLocalName: "ns1:age", uri: uriNs1)     // nil

// Overwrite attributes
element.addAttribute(XMLNode.attribute(withName: "ns1:age", stringValue: "33") as! XMLNode)
element.attribute(forName: "ns1:age")   // ns1:age="33"

element.addAttribute(XMLNode.attribute(withName: "ns1:name", uri: uriNs1, stringValue: "Tommy") as! XMLNode)
element.attribute(forLocalName: "name", uri: uriNs1)    // ns1:name="Tommy"

// Remove attributes
element.removeAttribute(forName: "name")
element.attribute(forLocalName: "name", uri: nil)       // nil
element.attribute(forLocalName: "name", uri: uriNs1)    // ns1:name="Tommy"

element.removeAttribute(forName: "ns1:name")
element.attribute(forLocalName: "name", uri: uriNs1)    // nil