I want to parse this xml in c# using LINQ. I have input as placemark name 'RFA13'.
I want to get the coordinates node for this input value.

```
<?xml version='1.0' encoding='UTF-8'?>
<kml xmlns='http://www.opengis.net/kml/2.2'>
    <Document>
            <name>EQDemo</name>
            <description><![CDATA[]]></description>
            <Folder>
                <name>Untitled layer</name>
                <Placemark>
                    <styleUrl>#line-000000-4</styleUrl>
                    <name>RFA13</name>
                    <Polygon>
                        <outerBoundaryIs>
                            <LinearRing>
                                <tessellate>0</tessellate>
                                <coordinates>-97.77405023574829,30.27369885454351,0.0 -97.79602289199829,30.261244946171974,</coordinates>
                            </LinearRing>
                        </outerBoundaryIs>
                    </Polygon>
                </Placemark>
            </Folder>
            <Folder>
                <name>Untitled layer</name>
                <Placemark>
                    <styleUrl>#line-000000-4</styleUrl>
                    <name>RFA14</name>
                    <Polygon>
                        <outerBoundaryIs>
                            <LinearRing>
                                <tessellate>0</tessellate>
                                <coordinates>-97.76755392551422,30.284103698805,0.0 -97.77020126581192,30.279346144221726,0.0 -97.77405023574829,30.27369885454351,0.0</coordinates>
                            </LinearRing>
                        </outerBoundaryIs>
                    </Polygon>
                </Placemark>
            </Folder>
    </Document>
</kml>

```