> ## 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/graph-reference/academic-standards), [Learning Progressions](/knowledge-graph/graph-reference/learning-progressions), [Learning Components](/knowledge-graph/graph-reference/learning-components), [Curriculum](/knowledge-graph/graph-reference/curriculum), [Standards Crosswalks](/knowledge-graph/graph-reference/standards-crosswalks), [Learner Variability Navigator](/knowledge-graph/graph-reference/learner-variability-navigator). Some properties apply only to specific relationship types; see [Standards Crosswalks](/knowledge-graph/graph-reference/standards-crosswalks) and the footnote above.
## Relationship properties
| Property | Description | Type | Cardinality |
| :--------------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | :-------- | :---------- |
| `author` | Author of this content | `String` | 1 |
| `attributionStatement` | 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` | Date on which the element was created | `Date` | 0..1 |
| `dateModified` | Date on which the element was most recently modified | `Date` | 0..1 |
| `description` | Description of the item | `String` | 1 |
| `factorCategory` | Category of the target factor | `String` | 0..1 |
| `identifier` | 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` | License document that applies to this content, typically indicated by URL | `String` | 1 |
| `provider` | Service provider, service operator, or service performer | `String` | 1 |
| `relationshipType` | 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` | Type of entity from which the relationship originates; specifies the class or category of the starting node in the connection | `String` | 1 |
| `sourceEntityKey` | Name of the property within the source entity that contains its unique identifier; used to locate and reference the entity in the dataset | `String` | 1 |
| `sourceEntityValue` | 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` | Type of entity to which the relationship points; specifies the class or category of the ending node in the connection | `String` | 1 |
| `targetEntityKey` | Name of the property within the target entity that contains its unique identifier; used to locate and reference the entity in the dataset | `String` | 1 |
| `targetEntityValue` | 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](/knowledge-graph/graph-reference/standards-crosswalks) and [Learner Variability Navigator](/knowledge-graph/graph-reference/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"]
}
```