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Valid Polish: Learn Polish and JSON Schema, together: A dual-learning workbook that teaches Polish grammar and JSON Schema validation in parallel. Absolute beginners in both subjects only.
In 2025, the ONERULER benchmark study tested AI accuracy across 26 languages. Polish came first. English came sixth.
This workbook takes that finding seriously.
Valid Polish teaches two things foundational Polish grammar and JSON Schema validation. Not as metaphor. As parallel systems with structural similarities that illuminate each other.
Polish nouns change form based on their role in a sentence. JSON properties have different validation rules depending on where they appear. Polish adjectives must agree with their nouns. Related schema fields must satisfy joint constraints. Polish negation triggers different noun endings. Conditional validation applies different rules based on another field's value.
These are not analogies. They are the same patterns appearing in different domains.
What You Will LearnOver 10 levels, you will work
Polish cases 1-3 (nominative, accusative, genitive)Present tense verb conjugationGender agreement (masculine, feminine, neuter)JSON Schema types, enums, properties, required fieldsConditional validation, combinators (allOf, oneOf, anyOf), and referencesBy Level 10, you will write coherent paragraphs in Polish and complete, professional JSON Schemas. This is functional competence, not fluency.
Who This Book Is ForYou should buy this book
You are an absolute beginner in both Polish AND JSON SchemaYou work with APIs, data structures, AI agents, or automation and want schema literacyYou are curious whether the ONERULER research applies to your workYou learn best by recognizing patterns across different systemsYou are willing to learn both subjects simultaneously (the method requires it)
Who This Book Is NOT ForYou should NOT buy this book
You already speak Polish conversationally or betterYou already write JSON Schemas confidentlyYou want Polish fluency (this is foundational grammar, not conversation)You want to learn Polish OR JSON Schema, but not both togetherYou need past tense, future tense, or all seven Polish cases (this covers present tense and five cases, with emphasis on three)You want comprehensive Polish vocabulary (we use a controlled word set throughout)You need advanced schema features like recursive schemas or format validationThis workbook is Volume 1 of a planned series. Future volumes pair Polish with SQL and Rust.
About the MethodThe author developed this workbook while learning both systems himself. The exercises are designed for pencil-and-paper practice. Each level contains explanations, examples, exercises, and answer keys. Levels build on each other, though you can skip to topics of interest.
Polish and JSON Schema both reward patient practice. Neither is a memorization task. Both are skills built through repeated use.
If you have read this far and are still uncertain, this book is probably not for you. If the structural parallel intrigues you and you are starting from zero in both subjects, begin with Level 1.
This workbook takes that finding seriously.
Valid Polish teaches two things foundational Polish grammar and JSON Schema validation. Not as metaphor. As parallel systems with structural similarities that illuminate each other.
Polish nouns change form based on their role in a sentence. JSON properties have different validation rules depending on where they appear. Polish adjectives must agree with their nouns. Related schema fields must satisfy joint constraints. Polish negation triggers different noun endings. Conditional validation applies different rules based on another field's value.
These are not analogies. They are the same patterns appearing in different domains.
What You Will LearnOver 10 levels, you will work
Polish cases 1-3 (nominative, accusative, genitive)Present tense verb conjugationGender agreement (masculine, feminine, neuter)JSON Schema types, enums, properties, required fieldsConditional validation, combinators (allOf, oneOf, anyOf), and referencesBy Level 10, you will write coherent paragraphs in Polish and complete, professional JSON Schemas. This is functional competence, not fluency.
Who This Book Is ForYou should buy this book
You are an absolute beginner in both Polish AND JSON SchemaYou work with APIs, data structures, AI agents, or automation and want schema literacyYou are curious whether the ONERULER research applies to your workYou learn best by recognizing patterns across different systemsYou are willing to learn both subjects simultaneously (the method requires it)
Who This Book Is NOT ForYou should NOT buy this book
You already speak Polish conversationally or betterYou already write JSON Schemas confidentlyYou want Polish fluency (this is foundational grammar, not conversation)You want to learn Polish OR JSON Schema, but not both togetherYou need past tense, future tense, or all seven Polish cases (this covers present tense and five cases, with emphasis on three)You want comprehensive Polish vocabulary (we use a controlled word set throughout)You need advanced schema features like recursive schemas or format validationThis workbook is Volume 1 of a planned series. Future volumes pair Polish with SQL and Rust.
About the MethodThe author developed this workbook while learning both systems himself. The exercises are designed for pencil-and-paper practice. Each level contains explanations, examples, exercises, and answer keys. Levels build on each other, though you can skip to topics of interest.
Polish and JSON Schema both reward patient practice. Neither is a memorization task. Both are skills built through repeated use.
If you have read this far and are still uncertain, this book is probably not for you. If the structural parallel intrigues you and you are starting from zero in both subjects, begin with Level 1.
332 pages, Kindle Edition
Published December 15, 2025
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