This specification, EPUB Canonical Fragment Identifier (epubcfi), defines a standardized method for<\/p>\n
referencing arbitrary content within an EPUB\u00ae Publication through the use of fragment identifiers.<\/p>\n
The Web has proven that the concept of hyperlinking is tremendously powerful, but EPUB Publications<\/p>\n
have been denied much of the benefit that hyperlinking makes possible because of the lack of a<\/p>\n
standardized scheme to link into them. Although proprietary schemes have been developed and<\/p>\n
implemented for individual Reading Systems, without a commonly-understood syntax there has been no<\/p>\n
way to achieve cross-platform interoperability. The functionality that can see significant benefit from<\/p>\n
breaking down this barrier, however, is varied: from reading location maintenance to annotation<\/p>\n
attachment to navigation, the ability to point into any Publication opens a whole new dimension not<\/p>\n
previously available to developers and Authors.<\/p>\n
This specification attempts to rectify this situation by defining an arbitrary structural reference that can<\/p>\n
uniquely identify any location, or simple range of locations, in a Publication: the EPUB CFI. The following<\/p>\n
considerations have strongly influenced the design and scope of this scheme:<\/p>\n
\u00b7 The mechanism used to reference content should be interoperable: references to a reading<\/p>\n
position created by one Reading System should be usable by another.<\/p>\n
\u00b7 Document references to EPUB content should be enabled in the same way that existing<\/p>\n
hyperlinks enable references throughout the Web.<\/p>\n
\u00b7 Each location in an EPUB file should be able to be identified without the need to modify the<\/p>\n
document.<\/p>\n
\u00b7 All fragment identifiers that reference the same logical location should be equal when compared.<\/p>\n
\u00b7 Comparison operations, including tests for sorting and comparison, should be able to be<\/p>\n
performed without accessing the referenced files.<\/p>\n
\u00b7 Simple manipulations should be possible without access to the original files (e.g., given a<\/p>\n
reference deep in a file, it should be possible to generate a reference to the start of the file).<\/p>\n
\u00b7 Identifier resolution should be reasonably efficient (e.g., processing of the first chapter is not<\/p>\n
required to resolve a fragment identifier that points to the last chapter).<\/p>\n
\u00b7 References should be able to recover their target locations through parser variations and document<\/p>\n
revisions.<\/p>\n
\u00b7 Expression of simple, contiguous ranges should be supported.<\/p>\n
\u00b7 An extensible mechanism to accommodate future reference recovery heuristics should be<\/p>\n
provided.<\/p>\n","protected":false},"excerpt":{"rendered":"
Information technology \u2014 Digital publishing \u2014 EPUB3 \u2014 Part 6: EPUB Canonical Fragment Identifier<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ISO<\/b><\/a><\/td>\n 2014-11<\/td>\n 20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":638115,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[695,2634],"product_tag":[],"class_list":{"0":"post-638101","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-35-240-30","7":"product_cat-iso","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/638101","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/638115"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=638101"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=638101"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=638101"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}