Polymorph Data Language

Jakob Jenkov

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The Polymorph Data Language (PDL) is a versatile, compact and fast alternative to JSON, YAML, XML and CSV.

By versatile, I mean that PDL can represent more data structures than JSON, including tabular data structures (like CSV), compact tree structures (using nested tabular data structures), and cyclic object graphs.

The Polymorph Data Language also supports embedding custom instructions which you can interpret at parse time - giving you even more flexibility and versatility.

By compact, I mean you are able to express some data structures, such as tables and trees, more compactly than with JSON. You can even use custom instructions to gain more compactness.

By fast, I mean that the syntax of the Polymorph Data Language is reasonably easy to implement a fast tokenizer for.

Polymorph Data Language is the textual counterpart to the binary encoding Polymorph Data Encoding. You can convert from PDL to PDE and from PDE to PDL, if you want to. But you can also just use PDL by itself.

In this book I explain what the Polymorph Data Language is, and why it is designed the way it is.

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Jakob Jenkov

Jakob Jenkov is a technopreneur, software architect, veteran developer, Java Champion and writer / publisher focused on the big ideas in the software and tech industry. Jakob feels most at home in the nexus between business and technology.

Jakob pursues his interests via his company Jenkov Aps (jenkov.com). Jakob has published more than 800 technical articles which attact millions of readers every year, and produced a few videos which attract hundreds of thousands of viewers every year.

Jakob has worked with web development and enterprise software since 1998 - mostly consulting for larger companies. The later years Jakob has taken a step back from development to focus on software architecture an the business context in which it exists. Jakob prefers a scientific approach to problem solving, favouring deep analysis and evidence over shallow understanding, assumptions and opinions whenever possible.

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