The XML input data format should be now reasonably clear from the following sample geodetic network. This example is taken from user's guide to Geodet/PC by Frantisek Charamza.
<?xml version="1.0" ?>
<!DOCTYPE gama-local
SYSTEM "http://www.gnu.org/software/gama/gama-local.dtd">
<gama-local>
<network axes-xy="sw">
<description>
XML input stream of points and observation data for program Gama
<!-- this is a XML comment -->
</description>
<!-- parameters are expressed with empty-element tag -->
<parameters sigma-act = "aposteriori" />
<points-observations>
<!-- fixed point, constrained point -->
<point id="1" y="644498.590" x="1054980.484" fix="xy" />
<point id="2" y="643654.101" x="1054933.801" adj="XY" />
<!-- computed / adjusted points -->
<point id="403" adj="xy" />
<point id="407" adj="xy" />
<point id="409" adj="xy" />
<point id="411" adj="xy" />
<point id="413" adj="xy" />
<point id="416" adj="xy" />
<point id="418" adj="xy" />
<point id="420" adj="xy" />
<point id="422" adj="xy" />
<point id="424" adj="xy" />
<obs from="1">
<direction to= "2" val= "0.0000" stdev="10.0" />
<direction to="422" val= "28.2057" stdev="10.0" />
<direction to="424" val= "60.4906" stdev="10.0" />
<direction to="403" val="324.3662" stdev="10.0" />
<direction to="407" val="382.8182" stdev="10.0" />
<distance to= "2" val= "845.777" stdev="5.0" />
<distance to="422" val= "493.793" stdev="5.0" />
<distance to="424" val= "288.301" stdev="5.0" />
<distance to="403" val= "388.536" stdev="5.0" />
<distance to="407" val= "498.750" stdev="5.0" />
</obs>
<obs from="2">
<direction to= "1" val="0.0000" stdev="10.0" />
<direction to="407" val="22.2376" stdev="10.0" />
<direction to="409" val="73.8984" stdev="10.0" />
<direction to="411" val="134.2090" stdev="10.0" />
<direction to="416" val="203.0706" stdev="10.0" />
<direction to="418" val="287.2951" stdev="10.0" />
<direction to="420" val="345.6928" stdev="10.0" />
<direction to="422" val="368.9908" stdev="10.0" />
<distance to="407" val="388.562" stdev="5.0" />
<distance to="409" val="257.498" stdev="5.0" />
<distance to="411" val="360.282" stdev="5.0" />
<distance to="416" val="338.919" stdev="5.0" />
<distance to="418" val="292.094" stdev="5.0" />
<distance to="420" val="261.408" stdev="5.0" />
<distance to="422" val="452.249" stdev="5.0" />
</obs>
<obs from="403">
<direction to= "1" val="0.0000" stdev="10.0" />
<direction to="407" val="313.5542" stdev="10.0" />
<distance to="407" val="405.403" stdev="5.0" />
</obs>
<obs from="407">
<direction to= "1" val="0.0000" stdev="10.0" />
<direction to="403" val="55.1013" stdev="10.0" />
<direction to="409" val="193.3410" stdev="10.0" />
<direction to= "2" val="239.4204" stdev="10.0" />
<direction to="422" val="323.5443" stdev="10.0" />
<distance to="409" val="281.997" stdev="5.0" />
<distance to="422" val="346.415" stdev="5.0" />
</obs>
<obs from="409">
<direction to= "2" val="0.0000" stdev="10.0" />
<direction to="407" val="102.2575" stdev="10.0" />
<direction to="411" val="310.1751" stdev="10.0" />
<distance to="411" val="296.281" stdev="5.0" />
</obs>
<obs from="411">
<direction to= "2" val="0.0000" stdev="10.0" />
<direction to="409" val="49.8647" stdev="10.0" />
<direction to="413" val="291.4953" stdev="10.0" />
<direction to="416" val="337.6667" stdev="10.0" />
<distance to="413" val="252.266" stdev="5.0" />
<distance to="416" val="360.449" stdev="5.0" />
</obs>
<obs from="413">
<direction to="411" val="0.0000" stdev="10.0" />
<direction to="416" val="295.3582" stdev="10.0" />
<distance to="416" val="239.745" stdev="5.0" />
</obs>
<obs from="416">
<direction to= "2" val="0.0000" stdev="10.0" />
<direction to="411" val="68.8065" stdev="10.0" />
<direction to="413" val="117.9922" stdev="10.0" />
<direction to="418" val="348.1606" stdev="10.0" />
<distance to="418" val="389.397" stdev="5.0" />
</obs>
<obs from="418">
<direction to= "2" val="0.0000" stdev="10.0" />
<direction to="416" val="63.9347" stdev="10.0" />
<direction to="420" val="336.3190" stdev="10.0" />
<distance to="420" val="246.594" stdev="5.0" />
</obs>
<obs from="420">
<direction to= "2" val="0.0000" stdev="10.0" />
<direction to="418" val="77.9221" stdev="10.0" />
<direction to="422" val="250.1804" stdev="10.0" />
<distance to="422" val="228.207" stdev="5.0" />
</obs>
<obs from="422">
<direction to= "2" val="0.0000" stdev="10.0" />
<direction to="420" val="26.8834" stdev="10.0" />
<direction to="424" val="225.7964" stdev="10.0" />
<direction to= "1" val="259.2124" stdev="10.0" />
<direction to="407" val="337.3724" stdev="10.0" />
<distance to="424" val="279.405" stdev="5.0" />
</obs>
<obs from="424">
<direction to= "1" val="0.0000" stdev="10.0" />
<direction to="422" val="134.2955" stdev="10.0" />
</obs>
</points-observations>
</network>
</gama-local>