ISO/TS 32005 Document management — Portable Document Format — PDF 1.7 and 2.0 structure namespace inclusion in ISO 32000-2. is a PDF 2.0 extension developed by ISO TC 171 SC 2 WG 9.
ISO 32000-2 introduced the mechanism for defining namespaces within a logically structured PDF document; identified two recognized namespaces for tagged PDF documents; and provided strict hierarchical inclusion rules for the standard structure namespace for PDF 2.0.
However, ISO 32000-2 did not specify restrictions and inclusion rules for the standard structure namespace for PDF 1.7.
This lack of specificity in usage of the PDF 1.7 namespace along with the absence of clear rules regarding the interaction of the PDF 1.7 namespace and PDF 2.0 namespace has caused ambiguity in the creation of tagged PDF documents conforming to ISO 32000-2.
The primary purpose of ISO/TS 32005 is to extend the rules already defined within ISO 32000-2 to resolve this ambiguity.