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PDF/A-1 Compliance Issues

For each PDF/A-1 validation issue we try to explain what it means and, if possible how to resolve it. For a more technical explanation of the issue we quote the related section of the ISO 19005-1 PDF/A Specification.

6.1
File Structure - General
6.1.2
File Header
6.1.3
File Trailer
6.1.4
Cross Reference Table
6.1.6
String Objects
6.1.7
Stream Objects
6.1.8
Indirect Objects
6.1.10
Filters
6.1.11
Embedded Files
6.1.12
Implementation Limits
6.1.13
Optional Content
6.2.2
Output Intent
6.2.3
Color Spaces - General
6.2.3.3
Uncalibrated Color Spaces
6.2.3.4
Separation and DeviceN Color Spaces
6.2.4
Images
6.2.5
Form XObjects
6.2.6
Reference XObjects
6.2.7
PostScript XObjects
6.2.8
Extended Graphics State
6.2.9
Rendering Intents
6.2.10
Content Streams
6.3.2
Font Types
6.3.3.1
General Font Issues
6.3.3.2
CIDFonts
6.3.3.3
CMaps
6.3.4
Embedded Font Programs
6.3.5
Font Subsets
6.3.6
Font Metrics
6.3.7
Character Encodings
6.3.8
Unicode Character Maps
6.4
Transparency
6.5.2
Annotation Types
6.5.3
Annotation Dictionaries
6.6.1
General Multimedia Content
6.6.2
Trigger Events
6.7
Metadata
6.7.2
Properties
6.7.3
Document Information Dictionary
6.7.5
XMP Header
6.7.8
Extension Schemas
6.7.9
Validation
6.7.11
Version and Conformance Level Identification
6.8.2.2
Mark information dictionary
6.8.3.3
Structure hierarchy
6.8.3.4
Structure types
6.9
Interactive Forms
TN0001
TechNote : Namespaces
TN0003
TechNote - Metadata
TN0008
Predefined XMP Properties
TN0008-2.2
XMP Basic Schema
TN0009
XMP Extension Schemas
TN0009-3.3
Unqualified RDF Attributes

Compliance Issue: Structure hierarchy

6.8.3.3 - ISO 19005-1 PDF/A Specification:

The logical structure of the conforming file shall be described by a structure hierarchy rooted in the StructTreeRoot entry of the document catalog dictionary, as described in PDF Reference 9.6.

Each structure element dictionary in the structure hierarchy shall have a Type entry with the name value of StructElem.

Writers of conforming files should attempt to capture a document’s logical structure hierarchy to the finest granularity possible, making use of the standard structure types for grouping elements, block-level structure elements, paragraph-like elements, list elements, table elements, inline-level structure elements, link elements and illustration elements, as defined in PDF Reference 9.7.4, to the fullest extent possible.

NOTE The explicit description of a document’s logical structure will prove valuable to future efforts to recover the document’s full semantic value for the purposes of rendering or migration to other data formats.

 


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