Evaluating XPath Expresssions

XPath Result of XPath Evaluation
(//planet[.]) 
<planet>
        <name>Mercury</name>
        <mass units="(Earth = 1)">.0553</mass>
        <day units="days">58.65</day>
        <radius units="miles">1516</radius>
        <density units="(Earth = 1)">.983</density>
        <distance units="millions miles">43.4</distance>
    </planet>
<planet>
        <name>Venus</name>
        <mass units="(Earth = 1)">.815</mass>
        <day units="days">116.75</day>
        <radius units="miles">3716</radius>
        <density units="(Earth = 1)">.943</density>
        <distance units="millions miles">66.8</distance>
    </planet>
<planet>
        <name>Earth</name>
        <name>Mother Earth</name>
        <mass units="(Earth = 1)">1</mass>
        <day units="days">1</day>
        <radius units="miles">2107</radius>
        <density units="(Earth = 1)">1</density>
        <distance units="millions miles">128.4</distance>
    </planet>
(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)[. mod 2 = 0] 
2
4
6
8
10

The XML Document

<planets>
    <planet>
        <name>Mercury</name>
        <mass units="(Earth = 1)">.0553</mass>
        <day units="days">58.65</day>
        <radius units="miles">1516</radius>
        <density units="(Earth = 1)">.983</density>
        <distance units="millions miles">43.4</distance>
    </planet>
    <planet>
        <name>Venus</name>
        <mass units="(Earth = 1)">.815</mass>
        <day units="days">116.75</day>
        <radius units="miles">3716</radius>
        <density units="(Earth = 1)">.943</density>
        <distance units="millions miles">66.8</distance>
    </planet>
    <planet>
        <name>Earth</name>
        <name>Mother Earth</name>
        <mass units="(Earth = 1)">1</mass>
        <day units="days">1</day>
        <radius units="miles">2107</radius>
        <density units="(Earth = 1)">1</density>
        <distance units="millions miles">128.4</distance>
    </planet>
</planets>