drobilla.net - Serd

Serd 0.32.8

drobilla — Tue, 10 Feb 2026 18:02:00 -0500

Serd 0.32.8 has been released. Serd is a lightweight C library for working with RDF data.

Changes:

Avoid use of snprintf() when writing
Fix unbounded reader stack growth when reading NQuads
Improve reader error handling
Relax nullability of SerdNode buffer field
Release reader stack memory on read error
Strengthen handling of corrupt UTF-8 input
Support writing all escapes in Turtle and TriG prefixed names

Serd 0.32.6

drobilla — Wed, 12 Nov 2025 18:54:00 -0500

Serd 0.32.6 has been released. Serd is a lightweight C library for working with RDF data.

Changes:

Avoid over-use of yielding meson options
Drop graphs when writing Turtle output
Eliminate recursion in the writer
Fix handling of bad predicates in anonymous blank nodes
Fix handling of some invalid EOF cases in lax mode
Fix indentation of named objects after anonymous objects
Fix indentation when ending anonymous nodes with many objects
Fix invalid characters in error messages
Fix reading numbers with no space before the final dot
Fix reading prefix names that start with "true." or "false."
Refuse to write incoherent statements
Remove project and version number from man page OS field
Write a blank line between statements and Turtle/TriG directives

Serd 0.32.4

drobilla — Sun, 19 Jan 2025 00:17:00 -0500

Serd 0.32.4 has been released. Serd is a lightweight C library for working with RDF data.

Changes:

Clean up enum declarations
Fix library current_version on MacOS
Fix overly permissive parsing of syntax names on the command line
Fix parsing NQuads lines with no space before the final dot
Fix reading chunks from files without trailing newlines
Fix rewriting special literals when datatype URIs are prefixed names
Gracefully handle errors while writing the end of anonymous nodes
Improve test suite coverage
Simplify some character classification and comparison code
Support reading lone lists in lax mode
Treat out of range unicode characters as errors
Write blank lines between graphs and statements in TriG

Serd 0.32.2

drobilla — Tue, 23 Jan 2024 19:32:00 -0500

Serd 0.32.2 has been released. Serd is a lightweight C library for working with RDF data.

Changes:

Enable clang nullability checks
Fix writing empty list objects within blank nodes

Serd 0.32.0

drobilla — Sun, 22 Oct 2023 19:36:00 -0400

Serd 0.32.0 has been released. Serd is a lightweight C library for working with RDF data.

Changes:

Add Windows path separator support to serd_node_new_file_uri()
Add long "help" and "version" options to serdi
Add options to disable html or singlehtml documentation
Add serd_reader_skip_until_byte() to public API
Allow SERD_API to be defined by the user
Avoid creating test files in the current directory
Avoid using ASCII grave as a quote
Check for POSIX features with the build system
Clean up and improve test suite
Clean up code
Fix crash when trying to read chunks without starting
Fix hang when skipping an error at EOF when lax parsing
Fix incorrect parsing of strange quote escape patterns
Fix possible hang when writing nested Turtle lists
Fix potential memory leaks when a write is aborted
Fix relative URI creation
Gracefully handle bad characters in Turtle blank node syntax
Gracefully handle bad characters in Turtle datatype syntax
Improve TriG pretty-printing and remove trailing newlines
Improve pretty-printing of lists and inline subjects
Improve serdi man page
Improve writer error handling
Make URI writing stricter by default
Make serd_reader_read_chunk() work with NQuads
Override pkg-config dependency within meson
Remove junk files from documentation install
Remove support for writing Turtle named inline nodes extension
Replace duplicated dox_to_sphinx script with sphinxygen dependency
Test header for warnings more strictly
Update standard test suites

Serd 0.30.16

drobilla — Fri, 09 Sep 2022 03:06:00 -0400

Serd 0.30.16 has been released. Serd is a lightweight C library for working with RDF data.

Changes:

Add SERD_STATIC to pkg-config Cflags for static-only builds
Adopt REUSE machine-readable licensing standard
Allow programs to be used from subproject
Fix spelling mistake in serdi man page

Serd 0.30.14

drobilla — Sun, 10 Jul 2022 16:58:00 -0400

Serd 0.30.14 has been released. Serd is a lightweight C library for working with RDF data.

Changes:

Fix memory consumption when reading documents
Switch to Meson build system
Update README and project metadata

Serd 0.30.12

drobilla — Thu, 26 May 2022 22:47:00 -0400

Serd 0.30.12 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Fix warnings and build issues with clang 13 and VS 2019
Fix writing long literals with triple quotes
Improve documentation style
Support combining several BSD-style command line flags in serdi
Write statements with invalid URI characters in lax mode

Serd 0.30.10

drobilla — Wed, 20 Jan 2021 15:55:00 -0500

Serd 0.30.10 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Add fallback configuration if documentation theme is unavailable
Fix SERD_DISABLE_DEPRECATED
Fix building for older MacOS versions on newer MacOS
Fix documentation installation directory

Serd 0.30.8

drobilla — Thu, 07 Jan 2021 21:19:00 -0500

Serd 0.30.8 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Deprecate serd_uri_to_path()
Don't install API man pages
Fix potential memory error when serialising URIs
Move headers to an include directory
Refuse to write relative URI references to NTriples
Remove the need for a generated configuration header
Remove use of C character class functions that may use locale
Split up and reorganize unit tests
Use aligned allocation via C11 or Windows API where possible

Serd 0.30.6

drobilla — Sun, 27 Sep 2020 10:51:00 -0400

Serd 0.30.6 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Fix various minor warnings and other code quality issues
Improve reader error handling
Make all free functions tolerant of NULL
Parse prefixed names more strictly

Serd 0.30.4

drobilla — Sun, 26 Apr 2020 16:04:00 -0400

Serd 0.30.4 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Fix EOF handling while reading in bulk or from strings
Fix lax handling of string errors
Fix reading from a null-delimited socket

Serd 0.30.2

drobilla — Sun, 20 Oct 2019 22:28:00 -0400

Serd 0.30.2 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Fix GCC 4 build
Fix colliding blank nodes when parsing TriG
Fix missing parse error messages
Fix parsing "a" abbreviation without padding whitespace
Fix parsing TriG graphs with several squashed trailing dots
Fix resolving some URIs against base URIs with no trailing slash
Improve build system and CI integration
Improve documentation

Serd 0.30.0

drobilla — Sun, 22 Jul 2018 18:34:00 -0400

Serd 0.30.0 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Add NTriples test suite
Add basic error tolerant parsing for line-based formats
Add serd_free for freeing memory allocated by serd
Add serdi option to write ASCII output
Clarify errors returned by serd_env_expand()
Clean up testing code
Fix building with MSVC
Fix length of base64 encoded nodes
Fix parsing local names that end with escaped dots
Fix reported error when reading statements with only a blank node
Improve relative URI serialisation
Make serdi guess input syntax from extension if unspecified
Make serdi syntax options case-insensitive
Report errors for all failing test cases
Support strict parsing of prefixed names
Upgrade to waf 2.0.9 and autowaf a328983
Use more efficient stack allocation and growth policies

Serd 0.28.0

drobilla — Fri, 21 Jul 2017 06:28:00 -0400

Serd 0.28.0 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Add serd_node_from_substring()
Add support for reading from a user provided callback
Fix hangs when reading corrupt UTF-8
Fix parsing of hex escapes in file URIs (thanks Johannes Mueller)
Fix strict parsing of abolute URI schemes
Gracefully handle applications that write corrupt UTF-8

Serd 0.26.0

drobilla — Tue, 10 Jan 2017 01:10:00 -0500

Serd 0.26.0 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Add support for TriG and NQuads
Add support for braindead SPARQL PREFIX and BASE directives

Serd 0.24.0

drobilla — Tue, 20 Sep 2016 02:21:00 -0400

Serd 0.24.0 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Add serd_node_new_relative_uri()
Fix construction and comparison of URIs with UTF-8 characters
Fix documentation generation
Fix potential out of bounds read
Fix unaligned memory access, undefined behaviour which breaks on ARM
Report I/O errors with message and return appropriate status code
Report missing statement separator errors
Update serdi man page

Serd 0.22.0

drobilla — Thu, 08 Oct 2015 19:34:00 -0400

Serd 0.22.0 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Add serd_reader_set_strict() and -l (lax) option to serdi to tolerate parsing URIs with escaped characters
Add support for Turtle named inline nodes extension
Fix clash resolution when a blank node ID prefix is set
Fix reading statements ending with a blank then dot with no space
Fix serd_reader_read_file() for URIs with escaped characters (spaces)
Fix serializing fractional decimals that would round up
Fix warnings when building with ISO C++ compilers
Remove dependence on fmax() to avoid portability issues
Report errors for invalid IRI characters and missing terminators
Show serdi errors in standard format
Upgrade to waf 1.8.14

Serd 0.20.0

drobilla — Fri, 08 Aug 2014 22:02:00 -0400

Serd 0.20.0 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Add -lm to pkg-config libs
Correctly handle posix_memalign failure
Don't write xsd:decimal literals to Turtle bare if they would not be read back with the same type
Fix const-correctness violation for reader input string
Fix possible crash in serd_writer_end_anon() when writing invalid lists
Generate blank names like :b1 and :B2 not :genid1 :docid2
Support new RDF 1.1 Turtle
Update to waf 1.7.14

Serd 0.18.2

drobilla — Sun, 23 Dec 2012 02:32:00 -0500

Serd 0.18.2 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Disable timestamps in HTML documentation for reproducible build
Fix bug that caused "a" abbreviation in non-predicate position
Fix clashing symbol "error" in amalgamation build
Fix crash when resolving against non-standard base URIs
Fix crash when serd_node_new_decimal is called with infinity or NaN
Update to waf 1.7.8 and autowaf r90 (install docs to versioned directory)

Serd 0.18.0

drobilla — Thu, 23 Aug 2012 04:18:00 -0400

Serd 0.18.0 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Add -e option to serdi to use incremental reading
Add -q option to serdi to suppress all non-data output, e.g. errors
Add error callback to reader and writer for custom error reporting
Add incremental read interface suitable for reading from infinite streams
Add option to build utilities as static binaries
Do not require a C++ compiler to build
Fix various hyper-strict warnings
Report write size correctly when invalid UTF-8 is encountered and a replacement character is written
Reset indent when finishing a write
Strip down API documentation to a single clean page
Support digits at start of local names as per new Turtle grammar
Upgrade to waf 1.7.2

Serd 0.14.0

drobilla — Tue, 17 Apr 2012 22:23:00 -0400

Serd 0.14.0 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Add SerdBulkSink for writing bulk output and corresponding serdi -B option
Add serd_chunk_sink for easy writing to a string
Add serd_file_sink for easy writing to a FILE* stream
Add serd_node_new_blob and serd_base64_decode for handling arbitrary binary data via base64 encoding
Add serd_node_new_file_uri() and serd_file_uri_parse() and implement proper URI to/from path hex escaping, etc.
Add serd_reader_set_default_graph() for reading a file as a named graph
Add serd_strtod(), serd_node_new_decimal(), and serd_node_new_integer() for locale-independent numeric node parsing/serialising
Add serd_uri_serialise_relative() for making URIs relative to a base where possible (by chopping a common prefix and adding dot segments)
Add serd_writer_get_env()
Add serd_writer_set_root_uri() and corresponding -r option to serdi to enable writing URIs with up references (../)
Add serdi -f option to prevent URI qualification
Escape ASCII control characters in output (e.g. fix problems with string literals that start with a backspace)
Handle a quote as the last character of a long string literal in the writer (by escaping it) rather than the reader, to avoid writing Turtle other tools fail to parse
Handle files and strings that start with a UTF-8 Byte Order Mark
Implement pretty-printing for collections
Improve URI resolution to cover most of the abnormal cases from RFC3986
Improve write performance by doing bulk writes for unescaped substrings
Install man page to DATADIR (e.g. PREFIX/share/man, not PREFIX/man)
Make URIs serialised by the writer properly escape characters
Parse collections iteratively in O(1) space
Remove use of multi-byte peek (readahead) and use exactly 1 page for read buffer (instead of 2)
Report read error if both "genid" and "docid" IDs are found in the same document, to prevent silent merging of distinct blank nodes
Report reason for failure to open file in serdi
Resolve dot segments in serd_uri_resolve() instead of at write time
Support Windows file://c:/foo URIs in serd_uri_to_path() on all platforms
Support compilation as C++ under MSVC++
Support file://localhost/foo URIs in serd_uri_to_path()
Tolerate invalid characters in string literals by replacing with the Unicode replacement character
Use path variables in pkgconfig files

Serd 0.5.0

drobilla — Thu, 29 Sep 2011 04:00:00 -0400

Serd 0.5.0 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Add ability to build static library
Add serd_env_set_prefix_from_strings for convenience
Add serd_strerror
Avoid writing illegal Turtle names as a result of URI qualifying
Fix erroneously equal SERD_ERR_BAD_SYNTAX and SERD_ERR_BAD_ARG
Fix pretty printing of successive blank descriptions, i.e. "] , ["
Gracefully handle NULL reader sinks

Serd 0.4.2

drobilla — Wed, 25 May 2011 23:00:00 -0400

Serd 0.4.2 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.

Changes:

Fix build system Python 3 compatibility
Fix compilation issues on some systems

Serd 0.4.0

drobilla — Wed, 25 May 2011 03:00:00 -0400

Serd 0.4.0 has been released. Serd is a lightweight C library for RDF syntax which supports reading and writing Turtle, TriG, NTriples, and NQuads. Serd is suitable for performance-critical or resource-limited applications, such as serialising very large data sets or embedded systems.