Needline (UPDM - MODAF aliases)
Creation
To create a Needline:
• From an OV-2 Operational Node Relationship Description: click the Shallow Needline or 
Shallow Uni-Directional Needline button, click the source element, and then click the destination element.
Shallow Needline or Shallow Uni-Directional Needline button, click the source element, and then click the destination element.The source and destination elements can be Known Resource, Node Port, Node Role or Problem Domain elements.
To create a Needline and connecting Node Port elements in one operation:
• From an OV-2 Operational Node Relationship Description: click the 
Complete Needline button, click the source Known Resource, Node Role or Problem Domain, and then click the destination Known Resource, Node Role or Problem Domain.
Complete Needline button, click the source Known Resource, Node Role or Problem Domain, and then click the destination Known Resource, Node Role or Problem Domain.On the Select Type dialog, select the type of the Node Port elements.
Appearance
When shown on an OV-2 Operational Node Relationship Description, a Needline appears as follows:
Relationships
The following relationships are of importance to a Needline:
• An Operational Exchange can be realized by a Needline.
The following sections provide information about how a Needline is used in the model.
Create a Needline from
Create from a Needline
Only the UPDM elements that can be created from all UPDM elements (Alias, Definition, Information and Metadata).
Shown on these diagrams, tables and matrices
In addition to the AV-2 Integrated Dictionary and TV-1 Standards Profile, which can show all UPDM elements:
UPDM writeable properties
The following writeable properties are available on the Needline tab of a Needline element's Property Pages:
• identifier
• URI