17. DTD related commands

Access to the DTD is limited to retrieving the name of the current DTD and to create an identification for the current DTD.

DTD commands

dtd name
	Returns the name of the current DTD
dtd ident
	Returns an identification for the current DTD

17.1 Retrieving the DTD name

The name of the current DTD can be retrieved with the dtd name command.

pathname dtd name

The command returns the name of the current DTD as a string. If no document has been loaded into the sgml widget, the dtd name command generates an error.

17.2 Getting an identification

It is convenient for some purposes to create a more specific identification of a DTD. One such case is a situation where different version of a DTD are used in parallel, for example when a production and a development version of a DTD co-exist. The dtd ident command can be used to extract an identification of the current DTD from the sgml widget. It has the following general form:

pathname dtd ident

The dtd ident command returns a list with three elements:

• The name of the current DTD as returned by the dtd name command.
• The public identifier for the current DTD if one has been specified.
• The system identifier for the current DTD. This is the effective external system identifier that has been created by resolving the public identifier (if one has been supplied) or by feeding the supplied system identifier to the catalog manager for possible system identifier remapping.

For documents that contain the DTD in the document prolog, the second and third list elements will be empty.