XML

Methods for constructing an XML object

Implicit: just inline some XML

var people = <people>
    <person>
        <name>bob</name>
    <person>
</people>

You can also insert values into inline XML

var name ="bob"
var kid = <kid>
    <name>Joe</name>
</kid>
var people = <people>
    <person>
        <name>{name}</name>
        <kids>{kid}</kids>
    <person>
</people>

URL: load form a URL

var con = new Myna.HttpConnection({
      url:'http://code.google.com/feeds/p/myna/updates/basic'
}).connect();
var xml=con.getResponseXml()

String: compile from a string

var xml = new Myna.File("path/to/file.xml").readString().toXml()

See Also

• String.toXml
• Myna.HttpConnection.getResponseXml
• Myna.xmlToObject

how to work with XML content

var c = <customer number="1721">
     <name>
          <first>John</first>
          <last>Smith</last>
     </name>
     <phone type="mobile">888-555-1212</phone>
     <phone type="office">888-555-2121</phone>
</customer> ;
var name = c.name.first + " " + c.name.last;
var num = c.@number;
var firstphone = c.phone[0];

var person = <person>
  <name>Bob Smith</name>
  <likes>
    <os>Linux</os>
    <browser>Firefox</browser>
    <language>JavaScript</language>
    <language>Python</language>
  </likes>
</person>;

Myna.println(person.name); // Bob Smith
Myna.println(person['name']); // Bob Smith
Myna.println(person.likes.browser); // Firefox
Myna.println(person['likes'].browser); // Firefox

//a special construct is needed for looping over E4X XMLLists

for each(var lang in person.language){
    Myna.println(lang)
}

//As a convenience, <Array.parse> understands XMLLists so you can use this
alternative:

Array.parse(person.language).forEach(function(lang){
    Myna.println(lang);
})

See

• https://developer.mozilla.org- /En- /E4X- /Processing_XML_with_E4X
• https://developer.mozilla.org- /en- /E4X_Tutorial- /Accessing_XML_children
• https://developer.mozilla.org- /en- /E4X_Tutorial- /Descendants_and_Filters

Namespaces can be defined via new Namespace(“uri”).  Tags can be referenced by namespace by prepending nsInstance:: in front of the tag name like so:

var con = new Myna.HttpConnection({
      url:'http://code.google.com/feeds/p/myna/updates/basic'
})

con.connect()
var feed=con.getResponseXml()
var atom = new Namespace("http://www.w3.org/2005/Atom")

Myna.println("Feed title: " + feed.atom::title)

Wildcard Namespace

You can use “*” as a wildcard Namespace like so:

Myna.println("Feed title: " + feed.*::title)

Setting Default Namespace

If all, or most, of your your elements us the same namespace, you can set that as the current default.

default xml namespace = new Namespace("http://www.w3.org/2005/Atom")

Myna.println("Feed title: " + feed.title)

Reading Namespace from an element

To extract the NS URI from an element use namespace()

default xml namespace = feed.namespace()

Multiple Namespaces

When working with XML comprising multiple namespaces, such as SOAP packets, it is best to pre-define those namespaces and use them like so:

var mynasoap    = new Namespace("mynasoap","http://myna.emptybrain.info/xml-soap");
var mynarpc     = new Namespace("mynarpc","http://rpc.xml.myna");
var impl        = new Namespace("impl","http://DefaultNamespace");
var wsdl        = new Namespace("wsdl","http://schemas.xmlsoap.org/wsdl/");
var wsdlsoap    = new Namespace("wsdlsoap","http://schemas.xmlsoap.org/wsdl/soap/");
var soapenc     = new Namespace("soapenc","http://schemas.xmlsoap.org/soap/encoding/");
var soapenv     = new Namespace("soapenv","http://schemas.xmlsoap.org/soap/envelope/");
var xsd         = new Namespace("xsd","http://www.w3.org/2001/XMLSchema");
var xsi     = new Namespace("xsi","http://www.w3.org/2001/XMLSchema-instance");

var response =
    <soapenv:Envelope
        xmlns:mynasoap={mynasoap}
        xmlns:xsi={xsi}
        xmlns:soapenv={soapenv}
        xmlns:impl={impl}
        s:encodingStyle={soapenc}
    >
        <soapenv:Body><impl:{"Response"} /></soapenv:Body>
    </soapenv:Envelope>

See

• https://developer.mozilla.org- /en- /E4X_Tutorial- /Namespaces

Common issues with XML objects

The <?xml ?> tag

There is a known bug in Rhino that E4X cannot parse XML content that includes this header.  String.toXml and Myna.HttpConnection.getResponseXml contain workarounds for this issue, so using on of those methods is recommended vs.  “new XML(string)”

See: https://bugzilla.mozilla.org- /show_bug.cgi?id=336551

Default Namespace

The default namespace is none.  This means that if you load XML that contains a namespace, such as an ATOM feed, then you will not be able to refer to individual items by tag name.  Here are some workarounds

var feed = <feed xmlns="http://www.w3.org/2005/Atom">
     <updated>2010-12-08T21:52:20Z</updated>
     <id>http://code.google.com/feeds/p/myna/updates/basic</id>
     <title>myna project updates - Google Code</title>
</feed>

Myna.println("title=" + feed.title); //prints title=

//use wildcard namespace
Myna.println("title=" +feed.*::title); //prints title=myna project updates - Google Code

//set default namespace to the ns of the top level element
default xml namespace = feed.namespace();
Myna.println("title=" +feed.title); //prints title=myna project updates - Google Code