> For the complete documentation index, see [llms.txt](https://www.csvpath.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.csvpath.org/topics/practical-stuff/language.md).

# Language Basics

The CsvPath's Validation Language is simple, declarative, and purpose-built. Here is a quick introduction. As well as in these pages, there is [more information and more examples on Github](https://github.com/dk107dk/csvpath/tree/main).

* [Root, Scanning, and Matching](#root-scanning-and-matching)
* [File References and Match Components](#file-references-and-match-components)
* [Scanning Expressions and Variables](#scanning-expressions-and-variables)
* [Comments and Linebreaks](#comments-and-linebreaks)
* [When/Do Expressions and References](#when-do-expressions-and-references)
* [Multiple Validation Rules](#multiple-validation-rules)
* [A Complex Validation Rule](#a-complex-validation-rule)

## Root, Scanning, and Matching

<figure><img src="/files/r7rCxcIj6FdKgWZRINvu" alt="" width="563"><figcaption></figcaption></figure>

## File References and Match Components

<figure><img src="/files/QwfpvmLbKm5G7oihB7L7" alt="" width="563"><figcaption></figcaption></figure>

## Scanning Expressions and Variables

<figure><img src="/files/s2BD6CtbdjvjzYi86pQX" alt="" width="563"><figcaption></figcaption></figure>

## Comments and Linebreaks

<figure><img src="/files/Dsa9GYbhkOofveo1Odeb" alt="" width="563"><figcaption></figcaption></figure>

## When/Do Expressions and References

<figure><img src="/files/f9jfIeiFp5iHk8dqOo3E" alt="" width="563"><figcaption></figcaption></figure>

## Multiple Validation Rules

<figure><img src="/files/U2dAGBbnP3tBdii4U8Xx" alt=""><figcaption></figcaption></figure>

## A Complex Validation Rule

<figure><img src="/files/UhtX3KQmBGiXCS835c8n" alt=""><figcaption></figcaption></figure>