# PdfGetXSaveNexus

`PdfGetXSaveNexus` persists PDF results into an NXprocess structure that lives alongside the original NXdata signal.  
This ensures the workflow outputs remain compatible with downstream NeXus-aware tools.

## Inputs

- `nxdata_url`: Target NXdata location expressed as `silx://.../file.h5::/entry/.../`.
- `results`: List of `PDFGetter` instances (see `PdfGetXProcessor`).
- `pdfgetx_options`: Effective `PDFConfig` used during processing.
- `info`: Metadata dictionary containing `nb_avg`.
- `subscan` (optional): Reserved hook for multi-scan acquisitions.

## Outputs

- `output_url`: URL pointing to the newly created `NXprocess` group.

## Stored structure

For each signal type (`iq`, `sq`, `fq`, `gr`) the task creates an `NXdata` subgroup with:

- datasets for the signal and its axis,
- units and display metadata,
- the default axis/signal attributes set for plotting tools.

It also writes the PDFgetX configuration and averaging metadata as NXnotes (`configuration` and `averaging_options`).

```python
from ewokspdf.tasks.save_nexus import PdfGetXSaveNexus

task = PdfGetXSaveNexus()
task(nxdata_url="silx:///data/results.h5::/entry/1.1/",
     results=processor.outputs.results,
     pdfgetx_options=processor.outputs.pdfgetx_options,
     info=processor.outputs.info)

print(task.outputs.output_url)  # e.g. silx:///data/results.h5::/entry/.../detector_PDF
```