EPUB2
EPUB2 is the second version of the EPUB e-book format specification. It uses toc.ncx as its navigation control file and is an earlier version of the EPUB standard.
Timeline (last 90 days)
toc.ncx is the navigation control file defined in EPUB2, in XML format, containing elements such as navMap and navPoint, used to build a hierarchical table of contents.
EPUB2 and EPUB3 use different navigation files, and supporting both requires an adaptation layer (shim), which the author considers worthwhile.
In EPUB parsing, the adaptation layer's role is to unify how navigation data is accessed in EPUB2 and EPUB3: for EPUB2 it parses toc.ncx, for EPUB3 it parses the <nav> element in nav.xhtml, and then converts them into a unified internal representation.
All Facts (3)
toc.ncx is the navigation control file defined in EPUB2, in XML format, containing elements such as navMap and navPoint, used to build a hierarchical table of contents.
50%UnverifiedEPUB2 and EPUB3 use different navigation files, and supporting both requires an adaptation layer (shim), which the author considers worthwhile.
50%UnverifiedIn EPUB parsing, the adaptation layer's role is to unify how navigation data is accessed in EPUB2 and EPUB3: for EPUB2 it parses toc.ncx, for EPUB3 it parses the <nav> element in nav.xhtml, and then converts them into a unified internal representation.
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