Overview
The vtk xml data file readers / writers store certain vtkInformation
entries that are set on vtkAbstractArray
's GetInformation()
object. Support is currently limited to numeric and string information keys, both single- and vector-valued. Only the information objects attached to arrays are written/read.
Array Information
Array information is embedded in the <DataArray>
XML element as a series of <InformationKey>
elements. The required attributes name
and location
specify the name and location strings associated with the key – for instance, the vtkDataArray::UNITS_LABEL()
key has name="UNITS_LABEL"
and location="vtkDataArray"
. The length
attribute is required for vector keys.
<DataArray [...]>
<InformationKey name="KeyName" location="KeyLocation" [ length="N" ]>
[...]
</InformationKey>
<InformationKey [...]>
[...]
</InformationKey>
[...]
</DataArray>
Specific examples of supported key types:
vtkInformationDoubleKey
<InformationKey name="Double" location="XMLTestKey">
1
</InformationKey>
vtkInformationDoubleVectorKey
<InformationKey name="DoubleVector" location="XMLTestKey" length="3">
<Value index="0">
1
</Value>
<Value index="1">
90
</Value>
<Value index="2">
260
</Value>
</InformationKey>
vtkInformationIdTypeKey
<InformationKey name="IdType" location="XMLTestKey">
5
</InformationKey>
vtkInformationStringKey
<InformationKey name="String" location="XMLTestKey">
Test String!
Line2
</InformationKey>
vtkInformationIntegerKey
<InformationKey name="Integer" location="XMLTestKey">
408
</InformationKey>
vtkInformationIntegerVectorKey
<InformationKey name="IntegerVector" location="XMLTestKey" length="3">
<Value index="0">
1
</Value>
<Value index="1">
5
</Value>
<Value index="2">
45
</Value>
</InformationKey>
vtkInformationStringVectorKey
<InformationKey name="StringVector" location="XMLTestKey" length="3">
<Value index="0">
First
</Value>
<Value index="1">
Second (with whitespace!)
</Value>
<Value index="2">
Third (with
newline!)
</Value>
</InformationKey>
vtkInformationUnsignedLongKey
<InformationKey name="UnsignedLong" location="XMLTestKey">
9
</InformationKey>