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rss/markup: added validators

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# Markup Language
A markup Language is way to encode text so that it has great amounts of structure and formatting.
The most common markup languages are [HTML](#html), Markdown, LaTeX and [XML](#xml).
## HTML
HTML is a markup language that is mostly used in the internet via the hypertext system and accessed
via [web browsers](/wiki/web_browser.md).
For styling HTML accordingly CSS is used most of the time.
HTML can be quite challenging to write, read and check for validity.
An easy way to do the latter one is a validation service.
One of the most used ones is the
[Markup Validation Service by W3C](https://validator.w3.org/#validate_by_input).
## XML
XML is a markup language often used together with [RSS Feeds](/wiki/rss.md).

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- [FreshRSS](/wiki/freshrss.md) is a self-hosted RSS aggregator with a web interface.
- [Feeder](https://f-droid.org/de/packages/com.nononsenseapps.feeder/) is an RSS reader for
[Android](/wiki/android.md) phones available on [F-Droid](/wiki/android/f-droid.md).
## Validation
RSS and XML are not very human-readable like other [Markup languages](/wiki/markup_language.md).
For this a validator can be used.
One of the most popular ones is the
[Feed Validation Service by W3C](https://validator.w3.org/feed/#validate_by_input).