VTK XML Reader/Writer Information Format

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">

1

90

260

</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">

1

5

45

</InformationKey> ```

vtkInformationStringVectorKey

``` <InformationKey name="StringVector" location="XMLTestKey" length="3">

First

Second (with whitespace!)

Third (with newline!)

</InformationKey> ```

vtkInformationUnsignedLongKey

``` <InformationKey name="UnsignedLong" location="XMLTestKey"> 9 </InformationKey> ```