This function returns the namespace URI prefixed to the primary bulleted list item tag specified in the document type configuration file (
.dcf) for the document type associated with
doc. This tag is inserted, along with the bulleted list block tag, when users select the bulleted list button on the
Application toolbar.
The function returns the null string if there isn't a isn't a namespace prefix for the tag, if no bulleted list item tag is designated for the document type, or if doc is invalid or an ASCII file. If doc is omitted or 0, the current document is used.