This function adds a declaration for a file parameter entity (that is, an external file parameter entity) to the document's internal subset.

name is the name of the entity. A leading percent sign % is optional. If the entity hasn't already been declared, an error message is displayed.

sysid is the entity's system identifier.

pubid is the entity's public identifier.

doc is the document identifier. By default, the current document is assumed.

inEntity signifies whether the declaration is within an entity. A non-zero value means the declaration is within an entity.

For example, after the function call:

the document's internal subset declaration will contain this:

The declaration is added to the beginning of the subset.