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<h3>touches function</h3>
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Returns 1 if the geometries have at least one point in common, but their interiors do not intersect.
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<h4>Syntax</h4>
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<pre>touches( a, b )</pre>
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<h4>Arguments</h4>
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a → geometry
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b → geometry
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<h4>Example</h4>
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<pre> touches( geomFromWKT( 'LINESTRING(5 3 , 4 4)' ) , geomFromWKT( 'LINESTRING(3 3 , 4 4 , 5 5)' )) → returns 1</pre>
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<pre> touches( geomFromWKT( 'POINT(4 4)' ) , geomFromWKT( 'POINT(5 5)' )) → returns 0</pre>
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