Use DOMImplementation to directly access the IDOMImplemenation interface identified by the DOMVendor property. This is the interface TXMLDocument uses to generate the IDOMDocument interface that is the value of DOMDocument. 

Typically, the value of DOMImplementation is obtained automatically, based on the value of the DOMVendor property. You can, however, assign the DOMImplementation property directly to an IDOMImplementation interface that you have obtained through some other mechanism. 

Most applications do not need to use the DOMImplementation property directly. If you do want to make use of DOMImplementation's low-level support, you must be familiar with the W3C Document Object Model (DOM) Level 2 Specification. 

You must assign a value to either DOMVendor or DOMImplementation before you can set the Active property to true. 

DOMVendor 

DOMDocument 

DOMVendors 

Active