 ## Viz Plug-ins User Guide

Version 5.0 | Published December 20, 2022 ©

# DataNodes and DataFields

DataPool is a hierarchical data structure composed of DataFields and nodes. DataFields are the lowest level of the hierarchy. The DataFields don’t have children. Nodes are groups of DataFields. The DataPool hierarchy has a root node. Each of the DataFields in the hierarchy has a parent node, either the root node or any other sub-level node.

# Example 1

The following example shows a hierarchy with a root, two nodes (NA and NB) and six DataFields. As can be seen each of the DataFields reside below a node. Setting the value of the DataField FA under the node NA follows the hierarchical structure to the required DataField:

`NA/FA=<some information>; `

In the case of field FC under NB:

`NB/FC=<some other information>; ` To set the data of all DataFields under the node NB, the following commands are sent:

`NB/FA=<info ``for`` A>; `
`NB/FB=<info ``for`` B>; `
`NB/FC=<info ``for`` C>; `

Note that there is a certain amount of redundancy because NB appears three times. To avoid using the node name every time, the following alternative format is used:

`NB={`
` FA=<info ``for`` A>; `
` FB=<info ``for`` B>; `
` FC=<info ``for`` C>; `
`}; `

The brackets determine the scope of the contained statements. In the above command the statement "FA=<info for A>;" is in the scope of object NB.

# Example 2

Consider the following example: In this example NB has a child node called NC. To set data to the field FB under NC the following command is sent:

`NB/NC/FB = <info ``for`` B>; `

In order to populate all the fields in NC:

`NB/NC= {`
` FA = <info ``for`` A>; `
` FB = <info ``for`` B>;`
`}; `

If we want to populate the whole hierarchy with data in one command:

`NA = {`
` FA =<info ``for`` A>; `
` FB=<info ``for`` B>; `
` FC=<info ``for`` C>;`
`}; `
`NB = {`
` FA =<info ``for`` A>; `
` FB=<info ``for`` B>; `
` NC = {`
` FA=<info ``for`` A>; `
` FB=<info ``for`` B>;`
` };`
`}; `