AS ISO 19005.2:2017 pdf free.Document management- Electronic document file format for long-term preservation Part 2: Use of ISO 32000-1 (PDF/A-2).
5.2 Level A conformance
Level A conforming files shall adhere to all of the requirements of this part of ISO 19005. A file meeting this
conformance level is said to be a “conforming PDF/A-2a file”.
5.3 Level B conformance
In recognition of the varying preservation needs of the diverse user communities making use of PDF files, this part of ISO 19005 defines a Level B conformance level. Level B conforming files shall adhere to all of the requirements of this part of ISO 19005 except those of 6.2.11 .7 and 6.7. A file meeting this conformance level is said to be a “conforming PDF/A-2b file”.
NOTE 1 The Level B conformance requirements are intended to be the minimum necessary to ensure that the rendered visual appearance of a conforming file is preservable over the long term. However, Level B conforming files might not have sufficiently rich internal information to allow for the preservation of the document’s logical structure and content text stream in natural reading order, which is provided by Level A conformance. The requirements for Level A conformance place greater responsibilities on writers of conforming files and those preparing such files, but these requirements allow for a higher level of document preservation service and confidence over time. Additionally, Level A conformance facilitates the accessibility of conforming files for physically impaired users.
NOTE 2 A Level B conforming file can include features from 6.2.11.7 and 6.7 but still be identified as Level B.
5.4 Level U conformance
In recognition of the varying preservation needs of the diverse user communities making use of PDF files, this part of ISO 19005 defines a Level U conformance level. Level U conforming files shall adhere to all of the requirements of this part of ISO 19005, except those of 6.7. A file meeting this conformance level is said to be a “conforming PDF/A-2u file”.
NOTE 1 The Level U conformance requirements are intended to be those necessary to ensure that not only is the rendered visual appearance of a conforming file preservable over the long term, but that any text contained in the document can be reliably extracted as a series of Unicode codepoints. However, Level U conforming files might not have sufficiently rich internal information to allow for the preservation of the document’s logical structure and content text stream in natural reading order, which is provided by Level A conformance. The requirements for Level A conformance place greater responsibilities on writers of conforming files and those preparing such files, but these requirements allow for a higher level of document preservation service and confidence over time. Additionally, Level A conformance facilitates the accessibility of conforming files for physically impaired users.
NOTE 2 A Level U conforming file can include features from 6.7 but still be identified as Level U.
NOTE 3 Level U is new to this part of ISO 19005 and therefore does not have an equivalent in ISO 19005-1.
5.5 Conforming readers
A conforming reader shall comply with all requirements regarding reader functional behaviour specified in this part of ISO 19005. The requirements of this part of ISO 19005 with respect to reader behaviour are stated in terms of general functional requirements applicable to all conforming readers. This part of ISO 19005 does not prescribe any specific technical design, user interface or implementation details of conforming readers.
The rendering and other processing of conforming files shall be performed as defined in ISO 32000-1, subject to the additional restrictions specified by this part of ISO 19005. Features described in PDF specifications that are not explicitly described in ISO 32000-1 shall be ignored by conforming readers.
Conforming PDF/A-2 readers shall read and process appropriately all PDF/A-2 files. In addition, conforming PDFIA-2 readers shall read and process appropriately all PDF/A-1 files as defined by ISO 19005-1.AS ISO 19005.2 pdf download.