020306-2	How is it possible to send binary data in e-mail, even though e-mail is based on sending text messages?
Answer, variant 1	Method 1: Encode the binary into text using the Content-Transfer-Encoding: BASE64. Method 2: Marking the binary data as Content-Transfer-Encoding: Binary. This require prior agreement, through ESTMP, that both the sending and receiving mail agent can handle binary and 8bit data.
Answer, Variant 2:	ancestor-id.dtd: <!ELEMENT ancestor-id (person*)> <!ELEMENT person EMPTY> <!ATTLIST person name CDATA #REQUIRED birthdate CDATA #REQUIRED id ID #REQUIRED mother IDREF #IMPLIED father IDREF #IMPLIED > ancestor-id.xml (example, not required): <?xml version="1.0" standalone="no"?> <!DOCTYPE ancestor-id SYSTEM "http://dsv.su.se/jpalme/internet-course/xml/ancestor-id.dtd"> <ancestor-id> <person name="Per Svensson" birthdate="19410201" id="p1" father="p2" mother="p3"/>

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