I don't understand the third para of 4.2.3 Reserved Prefixes
Reading Systems must resolve all reserved prefixes used in Package Documents using their pre-defined URIs. Reserved prefixes should not be overridden in the prefix attribute, but Reading Systems must use such local overrides when encountered.
Consider prefix="a11y: http://www.example.com". Then, will the prefix a11y resolve to "http://www.example.com" or "http://www.idpf.org/epub/vocab/package/a11y/#"? In my intepretation, the first sentence implies the latter, while the second sentence implies the former.
murata2makoto
>All comments
Does this help:
Reading Systems must resolve all reserved prefixes used in Package Documents using their pre-defined URIs _unless a local prefix is declared_.
The issue is that a reserved prefix can be introduced that conflicts with a prefix someone has already been using. In that case, the locally-defined prefix cannot be reinterpreted, as it would invalidate the original intent. If it resolves to the same URI, then there is no issue with a "redeclatation".
mattgarrish
on 18 Aug 2016
Related issues
murata2makoto
路
12Comments
BCWalters
路
6Comments
mattgarrish
路
6Comments
dauwhe
路
4Comments
mattgarrish
路
10Comments
Most helpful comment
Does this help:
Reading Systems must resolve all reserved prefixes used in Package Documents using their pre-defined URIs _unless a local prefix is declared_.
The issue is that a reserved prefix can be introduced that conflicts with a prefix someone has already been using. In that case, the locally-defined prefix cannot be reinterpreted, as it would invalidate the original intent. If it resolves to the same URI, then there is no issue with a "redeclatation".