OpenEdge Development:<br />Progress Dynamics Web Development Guide XHTML conformance

Release 10.1A: OpenEdge Development:
Progress Dynamics Web Development Guide

XHTML conformance

The default HTML layout file and the output from the UI Manager conform to the W3C XHTML standard.

At the beginning of the layout file, there is a Document Type Declaration (DTD) that references the standard:
<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE html  
  PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 
<html xml:lang="en" lang="en" 
  xmlns="http://www.w3.org/1999/xhtml"> 
To maintain XHTML conformance when you modify copies of the layout file, you should be familiar with the XHTML standard. For example, you should be aware that:

XHTML, unlike HTML, is case sensitive. For example, <IMG> and <img> are not equivalent in XHTML.

All XHTML tags require matching end tags. For example, <img> requires a matching </img> in XHTML. In HTML, the </img> end tag is optional.