A small Python utility to convert, merge, and read/persist RDF data in different formats, across different "persistence systems".
The command line utility covers merge and conversion functionality, and simplifies certain aspects of this. The
Run the rdfx.py script with Python having installed the packages required by requirements.txt.
To utilise the command line util run:
python rdfx.py *args
To convert a file:
python rdfx.py convert myfile.ttl -f nt -o output_dir
For multiple files:
python rdfx.py convert myfile1.ttl myfile2.ttl -f nt -o output_dir
A directory of files:
python rdfx.py convert files_dir -f nt -o output_dir
To merge multiple files:
python rdfx.py merge myfile1.ttl myfile2.ttl -f nt -o output_dir
To merge a directory of files:
python rdfx.py merge files_dir -f nt -o output_dir
To remove sort and remove unused prefixes in a turtle file:
python rdfx.py clean myfile.ttl
To simplify usage of the command line utility at present, the following behaviour has been set:
| Type | Output Filenames |
|---|---|
| Merge | merged.{format} |
| Convert | file1.{format} file2.{format} ... |
That is, when merging, the output filename will be "merged", with the correct file format. When converting, the output filename will be the same as the input filename, with the correct file format. This behaviour simplifies input to the command line util, allowing multiple files and directories to be input without confusion as to which specified filenames are for input or output, and mappings between input and output, especially directories or multiple files are converted/merged.
The python utilities behind the command line tool can be configured to set user specified filenames, for these cases use Python.
The SOP persistence system can be used to read and write to/from EDG master graphs and workflows. The SOP persistence system can be instantiated with the following optional parameters:
- location, defaults to "http://localhost:8083"
- username, defaults to "Administrator"
- password, defaults to ""
- timeout, defaults to 60 seconds Example instantiation with defaults:
from rdfx.persistence_systems import SOP
local_sop_ps = SOP()
The following methods are available on instances of the SOP class:
| Method | Paramters | Returns |
|---|---|---|
| read | graph URN rdf_format |
list of comments RDFLib Graph |
| write | RDFLib Graph graph IRI list of comments (optional) |
The IRI of the created graph |
| query | query graph_iri return_format |
The query results |
| asset_collection_size | asset_iri | Triples count for the given asset |
| create_datagraph | datagraph_name (optional) description (optional) subjectArea (optional) default_namespace (optional) HTTP headers (optional) |
datagraph IRI |
| create_workflow | graph_iri workflow_name (optional) HTTP headers (optional) |
workflow IRI |
| create_manifest | manifest_name (optional) description (optional) subjectArea (optional) default_namespace (optional) HTTP headers (optional) |
the IRI for the manifest |
| asset_exists | graph_name | true/false |
These usage notes come from running the help command in the tool, e.g. python rdfx.ph -h:
usage: rdfx.py [-h] [--format {ttl,turtle,json,json-ld,jsonld,owl,xml,rdf,nt,n3}] [-o OUTPUT] [--comments COMMENTS] {convert,merge} data [data ...]
positional arguments:
{convert,merge}
data Path to the RDF file or directory of files for merging or conversion.
optional arguments:
-h, --help show this help message and exit
--format {ttl,turtle,json,json-ld,jsonld,owl,xml,rdf,nt,n3}, -f {ttl,turtle,json,json-ld,jsonld,owl,xml,rdf,nt,n3}
The RDFlib token for the RDF format you want to convert the RDF file to.
-o OUTPUT, --output OUTPUT
if set, the output location for merged or converted files, defaults to the current working directory
--comments COMMENTS Comments to prepend to the RDF, turtle only.LGPL - see the LICENSE file for details
This uses RDFlib.
Original library: Nicholas J. Car Data Systems Architect SURROUND Australia Pty Ltd [email protected] GitHub: nicholascar ORCID: https://orcid.org/0000-0002-8742-7730
Updates around persistence systems: David Habgood Application Architect SURROUND Australia Pty Ltd [email protected] GitHub: nicholascar https://orcid.org/0000-0002-3322-1868