The flow-based approach to document accessibility ensures scalability and accuracy, making it ideal for enterprises handling dynamic, high-volume content. This is driven by standards like PDF/UA, WCAG, ADA, AODA, and Section 508. Meeting these standards requires not just compliance but also an efficient, scalable approach to creating accessible documents.
Historically, most accessibility tools relied on X-Y coordinate systems, a legacy of print-based document transformations. While effective for static layouts, this method struggles to address the complexities of modern, dynamic documents. ADEPT UA takes a fundamentally different approach, leveraging flow-based technology to deliver unparalleled efficiency and accuracy in accessibility tagging.
This blog explores the history of accessibility solutions, the innovations behind ADEPT UA, and why flow-based technology is the future of enterprise document accessibility.
The Origins of Accessibility Tools: Static Thinking in a Dynamic World
Most early accessibility tools emerged from systems designed to transform print-based documents into PDFs. These systems were built on X-Y coordinate models, where every element—text, tables, and images—was anchored to a fixed position on an 8.5 x 11 page.
Organizations often defaulted to systems that mirrored the expertise of their developers, and X-Y coordinate systems were familiar and straightforward for managing static, page-based content. However, static models fell short as enterprise documents began to evolve. Modern documents, such as credit card statements and insurance policies, often include dynamic elements that change based on data or customer interactions.
The limitations of X-Y systems became increasingly apparent during transitions to new document composition systems, which caused content to flow differently. Fixed-coordinate tagging required extensive rework each time layouts changed, creating inefficiencies and frustration for teams managing high-volume document production.
Recognizing these challenges, CDP began to rethink the approach to document tagging and comparison.
From STREAMdiff to DocDiff: The Evolution of Flow-Based Technology
CDP’s journey toward flow-based solutions began with its comparison tool, STREAMdiff. This tool analyzed differences between documents at a pixel-by-pixel level, highlighting discrepancies with precision. STREAMdiff remains widely used and highly effective for static and consistent content. However, evolving requirements for handling dynamic document flows led to the development of a new solution tailored to those needs.
STREAMdiff is a high-speed application designed to compare print data streams and PDF quickly and accurately. It identifies and highlights differences in visual output, providing a detailed list of changes and their exact locations. This streamlined approach simplifies the comparison process, saving time and reducing manual effort.

Documents rarely remain static in real-world scenarios. Changes in layout, such as those driven by updates to document composition systems, exceeded the capabilities of X-Y-based tools for handling dynamic content. This realization led to the development of DocDiff, a solution designed to handle documents with shifting content flows.
DocDiff took a fundamentally different approach by analyzing documents element by element rather than relying on static positions. This innovation made it possible to maintain accuracy and efficiency, even when document layouts evolved. The lessons learned from DocDiff ultimately formed the foundation for ADEPT UA.
DocDiff is designed to handle significant updates that affect document flow, making it ideal for complex changes like switching composition tools or adjusting layouts. It analyzes content flow across paragraphs, tables, and pages, ensuring consistency while detecting differences. With its advanced capabilities and user-friendly interface, DocDiff provides confidence and efficiency during major document updates.

How ADEPT UA’s Flow-Based Technology Works
ADEPT UA is built on the principle that accessibility tagging should reflect how people and technologies experience content, not where it happens to be on a page. Flow-based technology identifies and processes logical structures, such as headings, paragraphs, tables, and lists, rather than tying them to specific coordinates.
For instance, in a flow-based system, tables are treated as continuous elements, even when they span multiple pages. This allows for seamless navigation and ensures that content remains logically grouped. Headings and paragraphs are tagged based on their structural hierarchy, rather than their physical placement, which enhances usability and compliance.
This methodology aligns with how adaptive technologies like screen readers process content, ensuring accessibility that is both practical and user-friendly.
The Advantages of Flow-Based Document Accessibility
Flow-based technology solves many of the challenges that X-Y systems cannot address, making it the superior choice for enterprise document accessibility.
- Dynamic documents, such as financial statements or insurance policies, change frequently based on customer data. X-Y tools require tags to be recreated each time layouts shift. Flow-based tools like ADEPT UA preserve tags as content evolves, eliminating the need for constant re-tagging.
- Traditional systems often require a unique template for every document style, creating inefficiencies in environments with diverse document types. Flow-based technology reduces this burden by recognizing patterns across layouts, making it easier to manage templates.
- Enterprise environments demand solutions that can handle large-scale document production efficiently. ADEPT UA’s automation capabilities allow it to process high volumes of transactional documents while maintaining accuracy and compliance.
- By processing content as logical structures, ADEPT UA ensures compliance with PDF/UA, WCAG, and other accessibility standards. Its approach aligns seamlessly with how adaptive technologies interact with documents, enhancing the user experience.
Document Tagging in a Flow-Based Model
Accessibility tagging is the backbone of compliant documents. Tags define elements like headings, lists, and alternative text for images, enabling adaptive technologies to navigate content effectively.
In a flow-based system, tagging aligns with the natural flow of content. Tables, for example, are tagged as cohesive units, even when they cross page boundaries. Lists and headings maintain their hierarchy, ensuring that users can navigate documents intuitively.
This approach not only enhances usability but also reduces the effort required to maintain accessibility as documents evolve over time.
Flow-Based Accessibility in Action
In industries like finance and insurance, documents are constantly changing. Monthly statements, updated policies, and other dynamic content require tools that can adapt seamlessly. X-Y systems require re-tagging for each document change, which can increase operational complexity in dynamic environments. Flow-based solutions like ADEPT UA simplify this process by preserving tags automatically.
Flow-based tools like ADEPT UA eliminate this issue. Tags remain valid even as layouts change, reducing manual intervention and ensuring that compliance is preserved. This efficiency lowers the total cost of ownership for enterprises, making accessibility a sustainable process.
Conclusion: Redefining Accessibility with ADEPT UA
ADEPT UA represents a transformative approach to accessibility, built on CDP’s years of innovation in document technology. By leveraging flow-based methodology, it addresses the limitations of traditional X-Y systems and offers a solution that is efficient, scalable, and compliant.
As accessibility standards continue to evolve, organizations need tools that can keep up with modern demands. ADEPT UA not only meets these challenges but sets a new standard for creating accessible documents at scale.
Flow-based accessibility isn’t just the future—it’s the present, and ADEPT UA is leading the way.
Contact us today to schedule a demo and see how ADEPT UA can simplify your accessibility process, reduce costs, and ensure compliance with standards like PDF/UA, WCAG, and more.