Opera Software ASA

XML support in Opera Presto 2.7

Overview

Opera supports XML 1.0 and XML 1.1, and can parse and display XML documents.

• Opera can be both a validating and non-validating processor.
• Documents with Content-type text/xml, application/xml or with a subtype ending on +xml will be treated as an XML document.
• If a content-type is not available, the ".xml" file extension will also make the document be treated as XML.
• Opera does not use US-ASCII as the default character set for text/xml, but otherwise follows RFC3023.
  • Opera follows the rules for application/xml.
  • We recommend using application/xml instead of text/xml, and the use of an explicit character set declaration such as charset=UTF-8.

Binary XML, Binary WML (WBXML)

The Opera parser supports Binary XML; see XML Binary Characterization Working Group.

• Its main use case is to handle Binary WML (WBXML); see WAP Binary XML Content Format
• WBXML is turned on by default for all profiles except minimal.

XML with CSS

In order to display an XML document, a CSS style sheet should be present. Authors can attach Cascading Style Sheets to their XML documents through a processing instruction. Here is a simple example:

<?xml version="1.0"?>
<?xml-stylesheet href="shakespeare.css" type="text/css"?>

XForms

Opera does not offer support for XForms; see XForms, but extends support for the HTML5 Forms module as an alternative; see HTML5 Forms module.

XSLT, XPath and XSL-FO

Opera supports XSLT style sheets with the <?xml-stylesheet?> processing instruction; see Associating Style Sheets with XML documents Version 1.0. Opera supports XSLT 1.0 and XPath 1.0 with the following exceptions:

• The namespace-alias element is not supported.
• Opera does not support XSL-FO.

XML namespaces and XML ID

Opera fully supports XML namespaces.

• Namespace support for text/html was discontinued with Opera 9, and is not supported.
• Opera supports the xml:id attribute.

XML Events

Opera supports XML Events and it is used in X+V.

• HTML script and VoiceXML form can be handlers for XML Events.