Question

I have an xml that contains two groups of related values:

<Rows>
    <!-- first group -->
    <Row>
        <Sequence>100</Sequence>
        <Value>+</Value>
    </Row>
    <Row>
        <Sequence>105</Sequence>
        <Value>+</Value>
    </Row>    
    <Row>
        <Sequence>110</Sequence>
        <Value>-</Value>
    </Row>
    <!-- second group -->
    <Row>
        <Sequence>150</Sequence>
        <Value>20</Value>
    </Row>
    <Row>
        <Sequence>155</Sequence>
        <Value>15</Value>
    </Row>    
    <Row>
        <Sequence>160</Sequence>
        <Value>90</Value>
    </Row>    
</Rows>

Each element of 1st group related to an element of 2nd group: sequence -> sequence + 50

I need to get a node set of nodes from 2nd group which related nodes from 1st group contain + sign (nodes with sequences 150 and 155).

These nodes are needed for future sorting and enumerating.

/Rows/Row[contains(/Rows/Row[Sequence = (./Sequence - 50)]/Value, '+')]

I tried the above xpath, but failed as ./ is referenced to the current context (within second brackets), but I need to access to the parent one (within first brackets).

Do anybody know a solution for that?

Regards, Aikin

P.S. substring(./Sequence – 50, 1, 3) is used to get

Answer 1

Just turn the query upside down:

/Rows/Row[/Rows/Row[contains(Value, '+')]/Sequence = Sequence - 50]

It’s also worth noting that xsl:key may be useful here to speed things up.