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rss/markup: added validators
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wiki/markup_language.md
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wiki/markup_language.md
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# Markup Language
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A markup Language is way to encode text so that it has great amounts of structure and formatting.
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The most common markup languages are [HTML](#html), Markdown, LaTeX and [XML](#xml).
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## HTML
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HTML is a markup language that is mostly used in the internet via the hypertext system and accessed
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via [web browsers](/wiki/web_browser.md).
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For styling HTML accordingly CSS is used most of the time.
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HTML can be quite challenging to write, read and check for validity.
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An easy way to do the latter one is a validation service.
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One of the most used ones is the
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[Markup Validation Service by W3C](https://validator.w3.org/#validate_by_input).
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## XML
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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.
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- [Feeder](https://f-droid.org/de/packages/com.nononsenseapps.feeder/) is an RSS reader for
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[Android](/wiki/android.md) phones available on [F-Droid](/wiki/android/f-droid.md).
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## Validation
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RSS and XML are not very human-readable like other [Markup languages](/wiki/markup_language.md).
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For this a validator can be used.
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One of the most popular ones is the
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[Feed Validation Service by W3C](https://validator.w3.org/feed/#validate_by_input).
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