Read specific value from XML-file

2021 5 6
1 个回答
更新时间：2021 5 6
22 次查看（30 天）

0 个投票

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?

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回答（1 个）

Fangjun Jiang
Fangjun Jiang 2021-5-6

0 个投票

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.

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Marc Gebhardt
Marc Gebhardt 2021-5-6
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
Fangjun Jiang 2021-5-6
编辑：Fangjun Jiang 2021-5-6
I used the getElementsByTagName() method.
Marc Gebhardt
Marc Gebhardt 2021-5-6
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.

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