serdi is a fast command-line utility for streaming and processing RDF data. It reads an RDF document and
writes the data to stdout, possibly transformed and/or in a different syntax. By default, the input
syntax is guessed from the file extension, and output is written in NTriples or NQuads.
serdi can be used to check for syntax errors, convert from one syntax to another, pretty-print documents,
or transform URIs and blank node IDs.
The options are as follows:
-a Write ASCII output. If this is enabled, all non-ASCII characters will be escaped, even if the
output syntax allows them to be written in UTF-8.
-b Bulk output writing. If this is enabled, output will be written a page at a time, rather than a
byte at a time.
-cprefix
Chop prefix from matching blank node IDs. This is typically used to revert the effects of -p. For
example, with prefix “doc01”, the blank node _:doc01b42 will be emitted as _:b42.
-e Eat input one character at a time, rather than a page at a time which is the default. This is
useful when reading from a pipe since output will be generated immediately as input arrives, rather
than waiting until an entire page of input has arrived. With this option serdi uses one page less
memory, but will likely be significantly slower.
-f Fast and loose URI mode: preserve full URIs (without qualifying or making relative), and pass
prefixed names through as-is.
-h Print the command line options.
-isyntax
Read input as syntax. Case is ignored, valid values are: “NQuads”, “NTriples”, “TriG”, “Turtle”.
-l Lax (non-strict) parsing. If this is enabled, recoverable syntax errors will print a warning, but
parsing will proceed starting at the next statement if possible. Note that data may be lost when
using this option.
-osyntax
Write output as syntax. Case is ignored, valid values are: “NQuads”, “NTriples”, “TriG”, “Turtle”.
-pprefix
Add prefix to blank node IDs. This can be used to avoid clashes between blank node IDs in input
documents. The effects can be reversed in a later run with -c. For example, with prefix “doc01”,
the blank node _:b42 will be emitted as _:doc01b42.
-q Suppress all output except data.
-rroot
Keep relative URIs within a root URI. This will avoid creating any relative URI references with
leading path segments like ../ that enter a parent of root.
For example, if /home/you/file.ttl is written to the file /home/me/output.ttl using the
destination's base URI, then it could be written as <../you/file.ttl>. Setting -rfile:///home/me/
would prevent references from “escaping” like this, so the above would instead be written as
<file:///home/you/file.ttl>, since it can't be expressed relative to the root URI.
This is useful for keeping relative references within some directory.
-sstring
Parse string input instead of a file (terminates options).
-v Display version information and exit.
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