## build_date_pattern_map()


Build a DatePatternMap object for mapping date patterns between SDMX components.


Usage

``` python
build_date_pattern_map(
    source,
    target,
    pattern,
    frequency,
    id=None,
    locale="en",
    pattern_type="fixed",
    resolve_period=None
)
```


## Parameters


`source: str`  
The ID of the source component.

`target: str`  
The ID of the target component.

`pattern: str`  
The SDMX date pattern describing the source date (e.g., "MMM yy").

`frequency: str`  
The frequency code or reference (e.g., "M" for monthly).

`id: str | None = None`  
Optional map ID as defined in the registry.

`locale: str = ``"en"`  
Locale for parsing the input date pattern. Defaults to "en".

`pattern_type: Literal[``"fixed", `<span class="st">`"variable"``]`</span>` = ``"fixed"`  
Type of date pattern. Defaults to "fixed".

- "fixed": frequency is a fixed value (e.g., "A" for annual).
- "variable": frequency references a dimension or attribute (e.g., "FREQ").

`resolve_period: Literal[``"startOfPeriod", `<span class="st">`"endOfPeriod"``, ``"midPeriod"``] | None`</span>` = None`  
Point in time to resolve when mapping from low to high frequency periods.


## Returns


`DatePatternMap`  
A fully constructed DatePatternMap instance.


## Raises


`ValueError`  
If any required argument is empty or invalid.

`TypeError`  
If argument types do not match expected types.


## Examples


``` python
    >>> dpm = build_date_pattern_map(
    ...     source="DATE",
    ...     target="TIME_PERIOD",
    ...     pattern="MMM yy",
    ...     frequency="M"
    ... )
    >>> print(dpm)
```

    source: DATE, target: TIME_PERIOD, pattern: MMM yy, frequency: M