These are some of the main advantages of XML.
1) XML is text based
2) Information written in human language can be understood by XML due to its Unicode structure.
3) This is used for formatting language and data either offline or online.
4) It supports most of the documents
5) It is platform independent which makes it very easy to use.
These are some of the main disadvantage of XML.
1) XML syntax is large when compared to binary representations and is redundant.
2) Due to redundancy it occupies much higher memory and this increases costs on transmission, storage and processing costs.
3) Overlapping relationships require extra effort.
4) XML namespaces are problematic and namespace support can be difficult to implement in XML.