MATLAB

Question

我有以下 XML 结构：

<LMS>
<StressGradientCorrection>
      <Gradients>
            <Gradient>
                <Curve>
                    <Point>
                        <NormalizedGradient Value="0.01" />
                        <ReductionFactor Value="1" />
                    </Point>
                    <Point>
                        <NormalizedGradient Value="0.1" />
                        <ReductionFactor Value="1" />
                    </Point>
                    <Point>
                        <NormalizedGradient Value="1" />
                        <ReductionFactor Value="1" />
                    </Point>
                    <Point>
                        <NormalizedGradient Value="10" />
                        <ReductionFactor Value="1" />
                    </Point>
                </Curve>
            </Gradient>
        </Gradients>
    </StressGradientCorrection>
</LMS>

我需要根据同一个 <Point> 中 <NormalizedGadient> 的值更改每个 <ReductionFactor> 的值。到目前为止，我只能根据元素的属性（例如名称或值）来区分元素，但在这里我不能。如何根据兄弟元素的值区分元素？

这是开始的一段代码：

clear all
close all
clc

% Import the XPath classes
import javax.xml.xpath.*

% Construct the DOM.
doc = xmlread('SGC_EXAMPLE.xml');

% Creating an xPath
factory = javax.xml.xpath.XPathFactory.newInstance();
xpath = factory.newXPath();

Path = xpath.compile('/LMS/StressGradientCorrection/Gradients/Gradient/Curve/Point/NormalizedGradient[@Value="0.01"]');
List = Path.evaluate(doc, XPathConstants.NODESET);
Sibling = List.item(0);

% YOUR PROPOSAL HERE

MyNewlyFoundVariable.setAttribute('Value','5')

xmlwrite('Final.xml',doc);

到目前为止我只知道如何根据它的值找到兄弟姐妹。

Answer 1

您可以像这样找到以下兄弟姐妹：

/LMS/StressGradientCorrection/Gradients/Gradient/Curve/Point/NormalizedGradient[@Value="0.01"]/following-sibling::ReductionFactor/@Value

MATLAB - XML 查找兄弟元素

MATLAB - XML Find sibling element

xml

xpath

siblings