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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: Unqualified RDF Attributes

What does this mean?

What does this mean?

How can I fix it?

How can I fix it?

TN0009-3.3 - ISO 19005-1 PDF/A Specification:

The RDF Syntax Specification [7] mandates in section 6.1.4 “Attribute Event”:

"Several RDF attributes, including about, parseType, and a few others can be written without any namespace prefix. ... New documents SHOULD NOT use these unqualified attributes and applications MAY choose to warn when the unqualified form is seen in a document."

For example, the following construct is considered deprecated, and should not be used:

rdf:Description about=""

The following variant is preferred over the above since it avoids the deprecated use of an unqualified about attribute:

rdf:Description rdf:about="""

While Acrobat 8 accepts unqualified about attributes, the W3C Validator warns as follows:

Error: W102 unqualified use of rdf:about is deprecated.

Unqualified about attributes are occasionally used in examples in the XMP Specification [4], but should generally be avoided in XMP for PDF/A-1.

 


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