Property Value Rules

Rules

Use rules to define which values are allowed for this property. Depending on the LastBIM data type of the property, there are different value rules available. You can manage all of them in the properties dialog in the tab “Rules”.

Available value rules by data type:

• Text Value List, Starts With, Ends With, Contains, Regex, Min Length, Max Length

• Decimal, Integer Value List, Minimum, Maximum

• Boolean Equals

• Date No value rules for now

Additionally there are rules to define that values must be unique, optional or empty, that are activated via checkbox in the right sidebar.

ℹ️ Regex: What it is and how to use it

Regex (Regular Expression) can be used to describe value patterns. For example, you can describe the structure of an asset code that is 2 numbers, underscore, 3 letters, underscore, …

For that Regex uses a specific semantic. E.g. the example from above would be:
[0-9]{2}_[A-Z]{3}_.*

To help you to write a valid Regex that does what you expect, there is a Regex-Builder within LastBIM:

Override Value Rules

You can adjust the value rules of a property for each specification that it is assigned to.

If you set the the value rules on the base variant of the property, those rules will be the default rules for the property in all specifications. For specifications where the value rules need to be adjusted, you can go to the specification and use the override function to the property settings only for the current specification.

This way you can have e.g. a basic value list, that is used by default in all specifications. But for single specifications you can adjust the value list by adding specific values or remove some of the basic values.

The Value Library helps you to manage where each of the values of a value list is used (s. next section).

Rules Tab vs. Value Library

The Rules Tab summarizes all value rules for the current property variant.

The Value Library gives a more comprehensive view for the value lists. There you see all values for all variants of the property and which value is used in which variant.

Additionally, there, you can manage how the property values should be displayed to the user when using the plugin for attribution, and add a description for each value to explain how to use each value.