Here is a reproduction of the beginning of two example files included with the GedML utilities that illustrate both its straight GEDCOM-to-XML translation and the differences between the data formats (syntaxes).

GEDCOM
GedML
0 HEAD
1 SOUR TMG
2 VERS 3.7
1 SUBM @SUB1@
1 GEDC
2 VERS 5.5
2 FORM LINEAGE-LINKED
1 DEST GED55
1 DATE 13 FEB 2000
1 CHAR ANSEL
0 @SUB1@ SUBM
1 NAME Michael Kay
1 ADDR mhkay@iclway.co.uk
0 @I1@ INDI
1 REFN 1
1 NAME John Fitzgerald/Kennedy/
1 SEX M
1 CHAN
2 DATE 13 FEB 2000
1 BIRT
2 DATE 29 MAY 1917
2 PLAC Brookline, MA, USA
1 DEAT
2 DATE 22 NOV 1963
2 PLAC Dallas, TX, USA
2 NOTE Assassinated by Lee Harvey Oswald.
3 CONT
1 NOTE Educated at Harvard University. Elected Congressman in 1945
2 CONT aged 29; served three terms in the House of Representatives.
2 CONT Elected Senator in 1952. Elected President in 1960, the
2 CONT youngest ever President of the United States.
2 CONT
2 CONT
1 FAMS @F1@
1 FAMC @F2@
0 @I2@ INDI
1 REFN 2
1 NAME Jaqueline Lee/Bouvier/
1 SEX F
1 CHAN
2 DATE 13 FEB 2000
1 BIRT
2 DATE 28 JUL 1929
2 PLAC Southampton, Long Island, NY, USA
1 DEAT
2 DATE 19 MAY 1994
2 PLAC New York City, NY, USA
1 BURI
2 DATE 23 MAY 1994
2 PLAC Arlington National, VA, USA
1 FAMS @F1@
1 FAMS @F3@
1 FAMC @F4@
<?xml version="1.0" encoding="utf-8"?>
<GED>
<HEAD>
<SOUR>TMG<VERS>3.7</VERS>
</SOUR>
<SUBM REF="SUB1"/>
<GEDC>
<VERS>5.5</VERS>
<FORM>LINEAGE-LINKED</FORM>
</GEDC>
<DEST>GED55</DEST>
<DATE>13 FEB 2000</DATE>
<CHAR>ANSEL</CHAR>
</HEAD>
<SUBM ID="SUB1">
<NAME>Michael Kay</NAME>
<ADDR>mhkay@iclway.co.uk</ADDR>
</SUBM>
<INDI ID="I1">
<REFN>1</REFN>
<NAME>John Fitzgerald/Kennedy/</NAME>
<SEX>M</SEX>
<CHAN>
<DATE>13 FEB 2000</DATE>
</CHAN>
<BIRT>
<DATE>29 MAY 1917</DATE>
<PLAC>Brookline, MA, USA</PLAC>
</BIRT>
<DEAT>
<DATE>22 NOV 1963</DATE>
<PLAC>Dallas, TX, USA</PLAC>
<NOTE>Assassinated by Lee Harvey Oswald.<CONT/>
</NOTE>
</DEAT>
<NOTE>Educated at Harvard University. Elected Congressman in 1945
<CONT>aged 29; served three terms in the House of Representatives.</CONT>
<CONT>Elected Senator in 1952. Elected President in 1960, the</CONT>
<CONT>youngest ever President of the United States.</CONT>
<CONT/>
<CONT/>
</NOTE>
<FAMS REF="F1"/>
<FAMC REF="F2"/>
</INDI>
<INDI ID="I2">
<REFN>2</REFN>
<NAME>Jaqueline Lee/Bouvier/</NAME>
<SEX>F</SEX>
<CHAN>
<DATE>13 FEB 2000</DATE>
</CHAN>
<BIRT>
<DATE>28 JUL 1929</DATE>
<PLAC>Southampton, Long Island, NY, USA</PLAC>
</BIRT>
<DEAT>
<DATE>19 MAY 1994</DATE>
<PLAC>New York City, NY, USA</PLAC>
</DEAT>
<BURI>
<DATE>23 MAY 1994</DATE>
<PLAC>Arlington National, VA, USA</PLAC>
</BURI>
<FAMS REF="F1"/>
<FAMS REF="F3"/>
<FAMC REF="F4"/>
</INDI>
<INDI ID="I3">
<REFN>3</REFN>
<NAME>John Vernou/Bouvier/III</NAME>
<SEX>M</SEX>
<CHAN>
<DATE>12 FEB 2000</DATE>
</CHAN>
<FAMS REF="F4"/>
</INDI>

The complete files from which these snippets were taken are here:

KENNEDY.GED


kennedy.xml

GedML DTD

Here is the GedML DTD.