# Create time series reference values
> Supported in: Batch, Streaming
Creates time series reference values.
**Expression categories:** String
## Declared arguments
* **Series identifier:** The series identifiers contained in the time series sync.
*Expression\*
* **Time series sync RID:** The resource identifier (RID) of the time series sync containing the series identifiers.
*Expression\*
**Output type:** *String*
## Examples
### Example 1: Base case
**Argument values:**
* **Series identifier:** `seriesId`
* **Time series sync RID:** ri.time-series-catalog.main.sync.11111111
| seriesId | **Output** |
| ----- | ----- |
| seriesOne | {"seriesId":"seriesOne","syncRid":"ri.time-series-catalog.main.sync.11111111"} |
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### Example 2: Base case
**Argument values:**
* **Series identifier:** `seriesId`
* **Time series sync RID:** `syncRid`
| seriesId | syncRid | **Output** |
| ----- | ----- | ----- |
| seriesOne | ri.time-series-catalog.main.sync.11111111 | {"seriesId":"seriesOne","syncRid":"ri.time-series-catalog.main.sync.11111111"} |
| seriesTwo | ri.time-series-catalog.main.sync.22222222 | {"seriesId":"seriesTwo","syncRid":"ri.time-series-catalog.main.sync.22222222"} |
***
### Example 3: Null case
**Argument values:**
* **Series identifier:** `seriesId`
* **Time series sync RID:** ri.time-series-catalog.main.sync.11111111
| seriesId | **Output** |
| ----- | ----- |
| *null* | {"seriesId":"null","syncRid":"ri.time-series-catalog.main.sync.11111111"} |
***
### Example 4: Null case
**Argument values:**
* **Series identifier:** `seriesId`
* **Time series sync RID:** *null*
| seriesId | **Output** |
| ----- | ----- |
| seriesOne | {"seriesId":"seriesOne","syncRid":"null"} |
***