61 lines
3.3 KiB
Markdown
61 lines
3.3 KiB
Markdown
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# XML
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Extensible Markup Language (**XML**) is a markup language and file format for storing, transmitting, and reconstructing arbitrary data. It defines a set of rules for encoding documents in a format that is both human-readable and machine-readable.
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- Utilized often in [BBEdit](obsidian://open?vault=Coding%20Tips&file=Computers%2FMac%20OS%20X%2FBBEdit) for CLMs.
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- [This](https://www.w3schools.com/xml/xml_tree.asp) is a fantastic article explaining how an XML diagram which we learned about in software engineering directly translates to the XML code that is used by the system. This is why diagrams are so important in software engineering overall.
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- This [website](https://www.hezhengda.io/xml-file-from-quantum-espresso/) discusses how to extract XML files from quantum espresso.
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- XML formatter --> freeformatter.com
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For example, this is the XML diagram:
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![[Pasted image 20221208133914.png]]
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And this would be the XML code:
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```
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<?xml version="1.0" encoding="UTF-8**"**?>
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<bookstore>
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<book category="cooking">
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<title lang="en">Everyday Italian</title>
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<author>Giada De Laurentiis</author>
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<year>2005</year>
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<price>30.00</price>
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</book>
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<book category="children">
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<title lang="en">Harry Potter</title>
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<author>J K. Rowling</author>
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<year>2005</year>
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<price>29.99</price>
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</book>
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<book category="web">
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<title lang="en">Learning XML</title>
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<author>Erik T. Ray</author>
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<year>2003</year>
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<price>39.95</price>
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</book>
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</bookstore>
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```
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Wait so hold on just a second, wouldn't this have applications in quantum??
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- apparently, [this](https://github.com/photonquantum/actix-xml) is a XML extractor for actix-web a framework that is used in Rust
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![[Pasted image 20230901124958.png]]
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### XPATH
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A query language for navigating in XML document or extract elements in HTML documents
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[XPath Generator](https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbDNpRmQ5eUJ6amJvRFliRkFfcFI3Tk00RFNhQXxBQ3Jtc0tudXpjSVJ3RUE3TUhFTWtNMFIyVnlhaVFDUm5aTS1wRmZZVnVtdGlabVVPcDJ1Vkd5cnU0QkFINFZEeGR4T1VJX3lJM2tEVkx2ZDYyV3lkVlVHTnViN2RTc2J6WjE4c3MyMWt4aU9ZOUJnS0lvMnE5WQ&q=https%3A%2F%2Fwww.easycodeforall.com%2FXPathUtility.jsp&v=U-MZJ6rbqi4)
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Extract Value from [XPath Tool]([http://xpather.com/](https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqbEFrOUp0QnNFZGUwdlNNdDI0Z2ZsbkZmUmpld3xBQ3Jtc0tsX3JXTk1raHpQb2VHSEFOdlVBbTJ4eVlEdGk3a3BMSGpGczhMT0FTUWZpQ3hnV0h0UW1RRG1xOE5EMGNVSmRLRWo4SmtGSnczX2xjb0RBajR0aUVXOEtJRS1OSDk0eEc2NUp2a2xOM191dXZOMlNPTQ&q=http%3A%2F%2Fxpather.com%2F&v=U-MZJ6rbqi4))
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[Retrieve XPath](https://www.youtube.com/redirect?event=video_description&redir_token=QUFFLUhqblczUWVNMHB0ZFVxcGlXWGp3MGNjalhEUnBVQXxBQ3Jtc0tuaVRUTUJlN0hjeEpEQS03eS1jQmdGY0U4ODlDUzBqUE1xNVAzcFV6ZDZJM1U3clJmVy0tQkZIN2dNV0hDRjhYaTQyb3A3VVlzU2ZNazRSeWREM3E5dUthWWdETURQbWlXc2dGLTQ5LU8wa1JTR0dlUQ&q=https%3A%2F%2Fxmltoolbox.appspot.com%2Fxpath_generator.html&v=U-MZJ6rbqi4) by clicking on XML Document
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# Xpath (continued)
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XPath stands for XML Path Language. It is a language that allows you to navigate to a specific element in an XML document.
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XPaths will often be used in [BBEdit](obsidian://open?vault=Coding%20Tips&file=Computers%2FMac%20OS%20X%2FBBEdit).
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