XML markup Disadvantages

XML markup has a few disadvantages:

It can be verbose unless element and attribute names are chosen with care. In large documents the markup overhead need not be large, but in short messages it can be significantly more than the actual data, especially when the element or attribute names are concocted by machine.

Overlapping markup is not permitted (an element cannot start inside one element and end inside another): element markup must nest hierarchically.

Most applications require the document to be loaded to memory in its entirety before it can be parsed and processed. This can become a problem for truly huge documents (larger than the addressable memory of a computer system). Arguably, XML is the perhaps wrong tool to use for files this size, but there are streaming systems which will enable them to be processed.

Some of the software is truly mediocre.



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