Changing values in an existing XML file

Question

Natasha Stefani on 30 Jul 2020

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https://in.mathworks.com/matlabcentral/answers/573034-changing-values-in-an-existing-xml-file

Commented: Robert Ungi on 11 Jan 2022

Model.txt

Hi All,

I am fairly new to using matlab to parse through an XML file. I have an exisiting XML file that I am looking to change certain values. I am able to access the a level above the information that I actually want. I am unable to figure out how to alter the Location of each to the "Force Set" and also read the Body string so that I can do a logical comparision.

When I try to get the Location text content (variable: data) I get an error saying "Dot indexing is not supported for variables of this type."

<isDisabled>false</isDisabled>

<body>thorax</body>

</PathPoint>

<body>scapula</body>

</PathPoint>

</objects>

</PathPointSet>

    xmlfile = fullfile('Model.xml');
    DOMnode = xmlread(xmlfile);
    ForceSet = DOMnode.getElementsByTagName('ForceSet');
    Muscle = ForceSet.item(0).getElementsByTagName('Thelen2003Muscle'); % Level that contains all the muscles
    no_Musc_idx = Muscle.getLength-1 % Determines the max number of muscles
    
    
 for i = 0 : no_Musc_idx % Changes what muscle we are looking at (Range :  [0,25])
     
    Muscle_name = char(Muscle.item(i).getAttribute('name')) % returns the muscle name 0 - "LVS", 1 - "TRP1"
    GeometryPath = Muscle.item(i).getElementsByTagName('GeometryPath');
    PathPointSet = GeometryPath.item(0).getElementsByTagName('PathPointSet');
    PathPoint = PathPointSet.item(0).getElementsByTagName('PathPoint');
    
    for j =0: PathPoint.getLength -1 % goes through the muscle attachment points
       attachmentPoint_name= char(PathPoint.item(j).getAttribute('name')) % The name of the of node its looking at
        KidNode = PathPoint.item(j).getTextContent %Prints out both the children nodes...
        Location  = PathPoint.item(0).getElementsByTagName('Location');
        data = Location.item(0).getTextContent %trying to access the location value
    end
   % class(Location.item(0)) % This lets us know that the answer is a double.... I THINK?!?
   % PathPoint.item(j).setTextContent('0 0 0 0') % Sort of works but
   % changes the whole node and does not isolate the children nodes
 
 end