Parameter entities in internal subset

From: Ronald Bourret <rpbourret@rpbourret.com>
To: xml-dev <xml-dev@lists.xml.org>
Date: Sat, 6 Jan 2018 15:09:41 -0800

Play the video

I haven't been here for quite a while, so hello to everyone.

As a way to learn git, I've been fixing some ancient bugs in my DTD Parser, and that has led me to the Joy of Entities. I understand the intent, but am missing a few details and the deeper I dig, the more my head spins.

Section 2.8 (Prolog and Document Type Declaration), has a well-formedness constraint: "PEs in Internal Subset: In the internal DTD subset, parameter-entity references must not occur within markup declarations"

Paragraph 2 of section 4.5 states, "The literal entity value as given in an internal entity declaration (EntityValue) may contain character, parameter-entity, and general-entity references" and goes on to state that parameter-entity references are replaced.

Since markup declarations include entity declarations, why doesn't section 4.5 contradict section 2.8?

Thanks,

-- Ron

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