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XML is also a first-class citizen on the web. All major browsers have a built-in XML parser to access and manipulate XML. All major server-side programming la

XML is also a first-class citizen on the web. All major browsers have a built-in XML parser to access and manipulate XML. All major server-side programming languages have XML parsing and manipulation libraries. XML is a far better format for this; it is designed specifically for mixing text content with markup. This format is incredibly hard to read and debug. Once you've parsed this JSON, you're still left with a complex stringy structure that you then have to parse again anyway. The value of being in JSON is incredibly low.

atombender 8y ago
XML is not a native data structure to the web, and JSON arguably is. Browsers may have XML parsers built in, but XML requires APIs to work with in any meaningful way. XML's data model is complex. Where JSON allows you to build the entire data structure using pure JavaScript data types (objects, arrays, numbers, etc.), you can only build XML data reasonably via complex interactions of createElement(), appendChild() and so on. Compared to the thinness and transparency of JSON, the XML DOM has huge overhead. There's huge value in your document model also being your in-memory model. I'm not sure why you think this particular JSON schema is a "complex stringy structure". XML is a complex stringy structure! There's conceptually and semantically zero difference between <node style="normal">text</node> and {style: "normal", text: "text"}, other than the fact that the former requires an API to read and manipulate, and the latter doesn't, from the point of view of JavaScript code. XML has a specific formalized data model of elements, attributes and so on, but this is just a graph representation: You can lossly encode an XML DOM in JSON, and vice versa. The argument in favour of XML should revolve around the ecosystem of tools (XPath, XML Schema, namespaces, etc.) that allow you to work with it, but so far the comments here haven't conclusively highlighted these features as benefits. They also seem to ignore that with the exception of legacy enterprise software, the web world has largely (not entirely, but largely) moved away from XML. There's a reason we're using JSON over REST instead of SOAP. XML isn't the lingua franca of the web that W3C seemed to assume it would be during the early 2000s; JavaScript/JSON is.
- wvenable 8y ago
  > Browsers may have XML parsers built in, but XML requires APIs to work with in any meaningful way. But this format will require parsers to take the resulting objects, arrays, and numbers and reconstruct something very close to XML's data model anyway. > XML's data model is complex. So is this document format. With it's special "_type" keys and specially named nodes. XML is simpler since attributes and children are a native part of the format and the API. > There's huge value in your document model also being your in-memory model. Are you suggesting this exact model be the in-memory model? Because that would be pretty non-optimal. You'd likely want your in-memory model to be more powerful than a tree of dictionaries, arrays, and strings. Therefore parsing and storing an XML document on load/save is not a big deal. In fact, given the existence of an API that already handles attributes and nested nodes, it might even be easier. > XML has a specific formalized data model of elements, attributes and so on, but this is just a graph representation: You can lossly encode an XML DOM in JSON, and vice versa. Exactly. So why use a format that it obviously terrible for mixed text and markup? For any reasonable sized document in JSON will be impossible to follow yet XML would be comparatively straight forward. > There's a reason we're using JSON over REST instead of SOAP. XML isn't the lingua franca of the web that W3C seemed to assume it would be during the early 2000s; JavaScript/JSON is. Basically SOAP is an over-engineered solution to web RDP. It started out as XML-RPC which was far simpler and far more constrained like JSON. You could easily encode SOAP in JSON if you wanted. You're blaming the underlying technology for when it's used inappropriately but this is an example of JSON being used inappropriately! It's an over-engineered solution to a problem solved simpler by a different technology. "XML bad / JSON good" doesn't tell the whole story.
  - kilburn 8y ago
    > Are you suggesting this exact model be the in-memory model? Because that would be pretty non-optimal. You'd likely want your in-memory model to be more powerful than a tree of dictionaries, arrays, and strings. I'm pretty confident that this is actually the intended goal, particularly for web-based editors. Most "modern" web-based rich text editors work with an internal schema similar to this one, even when most of them support html/xml import/export too. In today's web ecosystem, it is hard to do much better than "javascript structure that gets diff-rendered to the DOM by a patching algorithm on updates". I think this is just a case of someone saying "hey, wouldn't it be great if all these editors used the same schema instead of very similar ones with minor differences?"

atombender 8y ago

XML is not a native data structure to the web, and JSON arguably is. Browsers may have XML parsers built in, but XML requires APIs to work with in any meaningful way. XML's data model is complex. Where JSON allows you to build the entire data structure using pure JavaScript data types (objects, arrays, numbers, etc.), you can only build XML data reasonably via complex interactions of createElement(), appendChild() and so on. Compared to the thinness and transparency of JSON, the XML DOM has huge overhead. There's huge value in your document model also being your in-memory model. I'm not sure why you think this particular JSON schema is a "complex stringy structure". XML is a complex stringy structure! There's conceptually and semantically zero difference between <node style="normal">text</node> and {style: "normal", text: "text"}, other than the fact that the former requires an API to read and manipulate, and the latter doesn't, from the point of view of JavaScript code. XML has a specific formalized data model of elements, attributes and so on, but this is just a graph representation: You can lossly encode an XML DOM in JSON, and vice versa. The argument in favour of XML should revolve around the ecosystem of tools (XPath, XML Schema, namespaces, etc.) that allow you to work with it, but so far the comments here haven't conclusively highlighted these features as benefits. They also seem to ignore that with the exception of legacy enterprise software, the web world has largely (not entirely, but largely) moved away from XML. There's a reason we're using JSON over REST instead of SOAP. XML isn't the lingua franca of the web that W3C seemed to assume it would be during the early 2000s; JavaScript/JSON is.

wvenable 8y ago
> Browsers may have XML parsers built in, but XML requires APIs to work with in any meaningful way. But this format will require parsers to take the resulting objects, arrays, and numbers and reconstruct something very close to XML's data model anyway. > XML's data model is complex. So is this document format. With it's special "_type" keys and specially named nodes. XML is simpler since attributes and children are a native part of the format and the API. > There's huge value in your document model also being your in-memory model. Are you suggesting this exact model be the in-memory model? Because that would be pretty non-optimal. You'd likely want your in-memory model to be more powerful than a tree of dictionaries, arrays, and strings. Therefore parsing and storing an XML document on load/save is not a big deal. In fact, given the existence of an API that already handles attributes and nested nodes, it might even be easier. > XML has a specific formalized data model of elements, attributes and so on, but this is just a graph representation: You can lossly encode an XML DOM in JSON, and vice versa. Exactly. So why use a format that it obviously terrible for mixed text and markup? For any reasonable sized document in JSON will be impossible to follow yet XML would be comparatively straight forward. > There's a reason we're using JSON over REST instead of SOAP. XML isn't the lingua franca of the web that W3C seemed to assume it would be during the early 2000s; JavaScript/JSON is. Basically SOAP is an over-engineered solution to web RDP. It started out as XML-RPC which was far simpler and far more constrained like JSON. You could easily encode SOAP in JSON if you wanted. You're blaming the underlying technology for when it's used inappropriately but this is an example of JSON being used inappropriately! It's an over-engineered solution to a problem solved simpler by a different technology. "XML bad / JSON good" doesn't tell the whole story.
- kilburn 8y ago
  > Are you suggesting this exact model be the in-memory model? Because that would be pretty non-optimal. You'd likely want your in-memory model to be more powerful than a tree of dictionaries, arrays, and strings. I'm pretty confident that this is actually the intended goal, particularly for web-based editors. Most "modern" web-based rich text editors work with an internal schema similar to this one, even when most of them support html/xml import/export too. In today's web ecosystem, it is hard to do much better than "javascript structure that gets diff-rendered to the DOM by a patching algorithm on updates". I think this is just a case of someone saying "hey, wouldn't it be great if all these editors used the same schema instead of very similar ones with minor differences?"