Simple PHP web service client

We will use request as static XML string. In real environment the request will be generated dynamically.
We wil do a simple curl call to access web service in REST mode.
<?php
header('Content-type: text/xml');
$xml = '<ws:dataDeliveryRequest dateFrom="2014-01-01" dateTo="2014-01-30"
    xmlns="http://geomodel.eu/schema/data/request"
    xmlns:ws="http://geomodel.eu/schema/ws/data"
    xmlns:geo="http://geomodel.eu/schema/common/geo"
    xmlns:pv="http://geomodel.eu/schema/common/pv"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
     
    <site id="site1dummy" name="First site" lat="48.61259" lng="20.827079">
        <geo:terrain elevation="111" azimuth="112" tilt="11"/>
        <geo:horizon>0:5 7.5:3 15:7 22.5:0</geo:horizon>
        <pv:geometry xsi:type="pv:GeometryFixedOneAngle" azimuth="165" tilt="22"/>
        <pv:system installationType="FREE_STANDING" dateStartup="2011-06-01" availability="99">
            <pv:module type="CSI" count="10" nominalPower="560">
                <pv:degradation>3</pv:degradation>
                <pv:degradationFirstYear>8</pv:degradationFirstYear>
                <pv:surfaceReflectance>0.13</pv:surfaceReflectance>
                <pv:powerTolerance low="10" high="90"/>
                <pv:nominalOperatingCellTemp>15</pv:nominalOperatingCellTemp>
                <pv:openCircuitVoltageCoeff>7</pv:openCircuitVoltageCoeff>
                <pv:shortCircuitCurrentCoeff>4</pv:shortCircuitCurrentCoeff>
                <pv:PmaxCoeff>10</pv:PmaxCoeff>
            </pv:module>
            <pv:inverter count="2" interconnection="PARALLEL">
                <pv:efficiency xsi:type="pv:EfficiencyConstant" percent="94"/>
                <pv:startPower>10</pv:startPower>
                <pv:limitationACPower>5</pv:limitationACPower>
                <pv:nominalDCPower>8</pv:nominalDCPower>
            </pv:inverter>
            <pv:losses>
                <pv:acLosses cables="1" transformer="2.1"/>
                <pv:dcLosses cables="1.2" mismatch="0.65" snowPollution="7" monthlySnowPollution="4 2 3 4 5 7 8 4 7 4 5 1"/>
            </pv:losses>
            <pv:topology xsi:type="pv:TopologySimple" type="PROPORTIONAL" relativeSpacing="1.5"/>
        </pv:system>
    </site>     
    <processing key="GHI DIF DNI PVOUT" summarization="HOURLY" terrainShading="true"/>     
</ws:dataDeliveryRequest>';
$url = 'https://solargis.info/ws/rest/datadelivery/request?key=demo';
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: text/xml'));
curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 
$response = curl_exec($ch);
curl_close($ch);
echo $response;
?>