> ## Documentation Index
> Fetch the complete documentation index at: https://docs.learningcommons.org/llms.txt
> Use this file to discover all available pages before exploring further.
# All relationships
> Reference for relationship properties and relationshipType values across Knowledge Graph entities, including edge structure and join behavior.
## Overview
Relationships share the same set of properties and are documented below. Take a look at the other dataset docs to learn more about the types of relationships for each entity.
`relationshipType` is the core property that differentiates the types of relationships between different entities.
## Data relationship diagram
This diagram illustrates the **shared property set** that every relationship edge has. It does **not** show entity-to-entity topology or which relationship types connect which entities; for that, see the dataset-specific docs linked below.
**Example:** A single edge—e.g. a **hasEducationalAlignment** from a Lesson to a standard—carries properties such as `relationshipType` ("hasEducationalAlignment"), `sourceEntity` ("Lesson"), `targetEntity` ("StandardsFrameworkItem"), `sourceEntityValue`, `targetEntityValue`, `author`, `license`, `description`, `identifier`. A **hasStandardAlignment** (crosswalk) edge also has `jaccard`, `stateLCCount`, `ccssLCCount`, `sharedLCCount`. So every edge in the graph shares this common shape; the diagram is about that shape, not which nodes connect to which. Dataset docs: [Academic standards](/knowledge-graph/entity-and-relationship-reference/academic-standards), [Learning progressions](/knowledge-graph/entity-and-relationship-reference/learning-progressions), [Learning components](/knowledge-graph/entity-and-relationship-reference/learning-components), [Curriculum](/knowledge-graph/entity-and-relationship-reference/curriculum), [Crosswalks](/knowledge-graph/entity-and-relationship-reference/crosswalks), [Learner Variability Navigator](/knowledge-graph/entity-and-relationship-reference/learner-variability-navigator). Some properties apply only to specific relationship types; see [Crosswalks](/knowledge-graph/entity-and-relationship-reference/crosswalks) and the footnote above.
## Relationship properties
| Property | Description | Type | Cardinality |
| :----------------------- | :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :------ | ----------- |
| **author** | The author of this content. | String | 1 |
| **attributionStatement** | A textual credit that acknowledges the source or creator of a work, included when required by the content’s license (e.g., Creative Commons BY). The statement specifies how the creator should be attributed in accordance with the license terms. | String | 1 |
| **ccssLCCount\*** | Number of LCs supporting the CCSS standard. | Integer | 1 |
| **connectionType\*\*** | Specifies whether the strategy supports or improves the target factor | String | 1 |
| **dateCreated** | The date on which the element was created. | Date | 0..1 |
| **dateModified** | The date on which the element was most recently modified. | Date | 0..1 |
| **description** | A description of the item. | String | 1 |
| **factorCategory\*\*** | The category of the target factor. | String | 0..1 |
| **identifier** | The identifier of the item, either as textual strings or as URL (URI) links. | String | 1 |
| **jaccard\*** | Proportion of shared LCs, calculated as the size of the intersection ÷ size of the union of LC sets. Range: (0, 1]. | Float | 1 |
| **license** | A license document that applies to this content, typically indicated by URL. | String | 1 |
| **provider** | The service provider, service operator, or service performer. | String | 1 |
| **relationshipType** | A normalized value that defines the semantic meaning of the connection between the source and target entities (e.g., hasChild, supports, buildsTowards). | String | 1 |
| **sharedLCCount\*** | Number of LCs supporting both the state and CCSS standard. | Integer | 1 |
| **sourceEntity** | The type of entity from which the relationship originates. This specifies the class or category of the starting node in the connection. | String | 1 |
| **sourceEntityKey** | The name of the property within the source entity that contains its unique identifier. This key is used to locate and reference the entity in the dataset. | String | 1 |
| **sourceEntityValue** | The identifier of the entity where the relationship originates. Represents the starting point of the connection. | String | 1 |
| **stateLCCount\*** | Number of LCs supporting the state standard. | Integer | 1 |
| **targetEntity** | The type of entity to which the relationship points. This specifies the class or category of the ending node in the connection. | String | 1 |
| **targetEntityKey** | The name of the property within the target entity that contains its unique identifier. This key is used to locate and reference the entity in the dataset. | String | 1 |
| **targetEntityValue** | The identifier of the entity the relationship points to. Represents the endpoint or destination of the connection. | String | 1 |
[***\* Indicates properties that are only available for standards crosswalks. Please see here for more information.***](/knowledge-graph/entity-and-relationship-reference/crosswalks)
**\*\* Indicates properties that are only available for Learner Variability Navigator data.**
## Example
The example below shows the relationship between an `Activity` and a `StandardsFrameworkItem`.
```json JSON theme={null}
{
"type": "relationship",
"identifier": "58de2d2a-34b2-512f-a14d-389b8840aa52",
"label": "hasEducationalAlignment",
"properties": {
"license": "https://creativecommons.org/licenses/by/4.0/",
"targetEntity": "StandardsFrameworkItem",
"attributionStatement": "Knowledge Graph is provided by Learning Commons under the CC BY-4.0 license. Learning Commons received the scope and sequence of the Illustrative Mathematics 360 curriculum under CC BY-4.0 from Illustrative Mathematics.",
"identifier": "58de2d2a-34b2-512f-a14d-389b8840aa52",
"curriculumAlignmentType": "addressing",
"provider": "Learning Commons",
"sourceEntity": "Activity",
"sourceEntityKey": "identifier",
"alignmentType": "teaches",
"author": "Illustrative Mathematics",
"targetEntityKey": "caseIdentifierUUID",
"relationshipType": "hasEducationalAlignment"
},
"source_identifier": "im:3c223476-a9f5-568d-8176-0ee31861723b",
"source_labels": ["Activity"],
"target_identifier": "827a633a-b88a-5ce9-8a7a-18369c547363",
"target_labels": ["StandardsFrameworkItem"]
}
```