.. _config_ref tasks fetch:

``fetch``
=========

Fetch task; its only job is to fetch any external data file (e.g., PDB).

Single-valued attributes:

  * ``source``: Source for the initial coordinate file; one of ``rcsb`` (for the RCSB PDB), ``alphafold`` (for the AlphaFold DB), ``opm`` (for the OPM database), or ``local`` (for a local file) (default: rcsb)

  * ``sourceID``: ID of the source file; if source is ``local``, a file ``sourceID.pdb`` or ``sourceID.cif`` must exist in the working directory

  * ``source_format``: Format of the source file; this should be ``pdb`` or ``cif`` (default: pdb)



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