# xml pyx > Convert an XML document to PYX (ESIS - ISO 8879) format. > More information: . - Convert an XML document to PYX format: `xml pyx {{path/to/input.xml|URI}} > {{path/to/output.pyx}}` - Convert an XML document from `stdin` to PYX format: `cat {{path/to/input.xml}} | xml pyx > {{path/to/output.pyx}}` - Display help for the `pyx` subcommand: `xml pyx --help`