Read specific value from XML-file

Hi guys,

my question is about the reading of information from an xml-file of only a special type of object

Example part of XML-file:

<cim:Car rdf:ID="_00c7c220-2f78-4eb0-80fd">
    <cim:Equipment.BaseGroup rdf:resource="#_29355f3f-035d-494e-8549" />
    <cim:Motor.weigth>10</cim:Motor.weigth>
    <cim:Motor.length>2.36517e01</cim:Motor.length>
    <cim:Motor.length>7</cim:Motor.length>
    <cim:IdentifiedObject.name>Nice_blue_car</cim:IdentifiedObject.name>
  </cim:Car>
  <cim:Car rdf:ID="_01281464-7eca-43db-aca9">
    <cim:Equipment.BaseGroup rdf:resource="#_29355f3f-035d-494e-8549" />
    <cim:Motor.weigth>15</cim:Motor.weigth>
    <cim:Motor.length>2.33165e01</cim:Motor.length>
    <cim:Motor.length>4</cim:Motor.length>
    <cim:IdentifiedObject.name>Nice_red_car</cim:IdentifiedObject.name>
  </cim:Car>
  <cim:Bike rdf:ID="_02de5fa9-368e-4d5d-9a2f">
    <cim:Equipment.BaseGroup rdf:resource="#_29355f3f-035d-494e-8549" />
    <cim:Motor.weigth>0.5</cim:Motor.weigth>
    <cim:Motor.length>4.54142e01</cim:Motor.length>
    <cim:Motor.length>2</cim:Motor.length>
    <cim:IdentifiedObject.name>Nice_yellow_bike</cim:IdentifiedObject.name>
  </cim:Bike>

In this example, there are vehicles listed. Some cars and a bike. For example, i want to read out the names ("IdentifiedObject.name") but only from all objects out the the group Car. The result should be a cell, with size (number of elements of type car x 1) with the names in.

How can I do this?

Answer 1

[Fangjun Jiang]

The short answer is to use xmlread(). I've done it before. The actual code depends on the schema.

You may also try xml2struct(). It seems much easier.

[Marc Gebhardt]

I am already using xmlread. Later on i am extracting the specific information with two subfunctions

for text information:

xml.item(t).getTextContent()

for ID information:

 for t=0:xml.getLength-1
        Attr=parseAttributes(xml.item(t));
        switch Type
            case 'ID'
                out{t+1,1}=Attr.rdf_colon_ID;
            case 'resource'
                out{t+1,1}=Attr.rdf_colon_resource;
            case 'about'
                out{t+1,1}=Attr.rdf_colon_about;
        end
    end

There i can only read out all IdentifiedObject.name but I only want to get the names from type car.

XML2struct is not useful, because of the deep structure of the xml file with long names, so that there will be a mess of structs later on.

[Fangjun Jiang]

I used the getElementsByTagName() method.

[Marc Gebhardt]

Then let us leave this kind of general answers please.

Just write one command, which lists the names for this easy example withput a loop over all elements.