SGML is the superset of HTML and XML. There are rich HTML and XML parsers available. Could you please explain me the
Usage of SGML (Sample business scneario) in current bussiness domains?
is it when dealing with legecy systems ?
There are HTML and XML parsers to HTML,xml documents. Why SGML parsers ?
My thinking might be wrong please give me some feedback?
SGML is not just legacy, there are large amount of organisations who continue to use SGML for document publication in the aeronautical industry (think Boeing /Airbus / Embraer), i.e. their most recent revisions of data are published directly in SGML.
Industries that follow data standards, e.g. Air Transportation Association (ATA), are locked in to using the format used by the standards authority, so SGML is still arond in a big way.
At some point in the technical publications chain, this usually gets converted to XML and/or HTML but as an original data source, SGML is around for some tie to come.