> ## Documentation Index > Fetch the complete documentation index at: https://docs.aseeflow.org/llms.txt > Use this file to discover all available pages before exploring further. # Decision Requirements Graph Decision Requirements Graph A Decision Requirements Graph (DRG) models a domain of decision-making, showing the most important elements involved in it and the dependencies between them. The elements modeled are [decisions], [input data], and [knowledge sources]. The visual representation of a DRG is called Decision Requirements Diagram (DRD). In the XML a DRG is represented by the `definitions` element. ```xml theme={null} ``` ## Decision Requirements Graph Name Decision Requirements Graph Name The name describes the DRG. It is set as the `name` attribute on the `definitions` element. ```xml theme={null} ``` ## Decision Requirements Graph Id Decision Requirements Graph Id The id is the technical identifier of the DRG. It is set in the `id` attribute on the `definitions` element. Each DRG should have an unique id when it is [deployed] to ASEE Flow. The engine uses the id as the decision requirements definition key of the deployed `DecisionRequirementsDefinition`. ```xml theme={null} ``` ## Decision Decision A decision requirements graph can have one or more decisions. A decision has a [name] which is shown in the DRD and an [id]. The decision logic inside the decision must be either a [decision table] or a [decision literal expression]. A decision is represented by a `decision` element inside the `definitions` XML element. ```xml theme={null} ``` ### Required Decisions Required Decision A decision can have one or more required decisions which it depends on. A required decision is represented by a `requiredDecision` element inside an `informationRequirement` XML element. It has a `href` attribute and the value starts with `#` followed by the [decision id](/reference/dmn/decision-table#decision-id) of the required decision. ```xml theme={null} ``` ## Input Data Input Data An input data denotes information used as an input by one or more decisions. It is represented by an `inputData` element inside the `definitions` element. ```xml theme={null} ``` Note that an input data has no execution semantics and is ignored by the ASEE Flow DMN engine. ## Knowledge Source Knowledge Source A knowledge source denotes an authority for a Decision. It is represented by a `knowledgeSource` element inside the `definitions` element. ```xml theme={null} ``` Note that a knowledge source has no execution semantics and is ignored by the ASEE Flow DMN engine. [decisions]: #decision [input data]: #input-data [knowledge sources]: #knowledge-source [decision table]: /reference/dmn/decision-table [deployed]: /user-guide/process-engine/decisions/repository#deploying-a-decision [decision literal expression]: /reference/dmn/decision-literal-expression [id]: /reference/dmn/decision-table#decision-id [name]: /reference/dmn/decision-table#decision-name