Extensible markup language
I am speaking largely from a developers standpoint, but I can say that the shift away from XML in software development is a strong one.
XML allows the use of any of the Unicode-defined encodings, and any other encodings whose characters also appear in Unicode.
Disparate systems communicate with each other by exchanging XML messages.
The specification places requirements on what an XML processor must do and not do, but the application is outside its scope. That was always the big problem with XML - it allowed you to do some things easily, but tough things that might require logic became impossible.
You can find and download formal technical specifications here, because we publish them.
We are interested in technical comments and errata. XML is used extensively to underpin various publishing formats.
I am speaking largely from a developers standpoint, but I can say that the shift away from XML in software development is a strong one. Characters and escaping[ edit ] XML documents consist entirely of characters from the Unicode repertoire. The characters between the start-tag and end-tag, if any, are the element's content, and may contain markup, including other elements, which are called child elements. Originally designed to meet the challenges of large-scale electronic publishing, XML is also playing an increasingly important role in the exchange of a wide variety of data on the Web and elsewhere. In most applications the files quickly got far too large to manage, and for the longest time there were very few syntax validators, so a missed end tag or a single quote where there should have been a double quote would mean a runtime error that would be next to impossible to track down. XML also provides a mechanism whereby an XML processor can reliably, without any prior knowledge, determine which encoding is being used. An XML attribute can only have a single value and each attribute can appear at most once on each element.
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