Rasqal RDF Query Library - Release Notes
WARNING: ABI AND API CHANGED IN THIS RELEASE.
This means: functions were removed, modified and added.
Consequently the shared library major soname version has changed from 0 to 1.
The header files moved to be installed in
PREFIX/include/rasqal such as
/usr/include/rasqal for usual installs.
NOTE: In the next release of rasqal, the
rasqal-config utility that provides the compile and link
args will be deprecated, generate a warning when run and will turn into a
wrapper for pkg-config raptor ...
It will be removed in a future release.
Major Changes (break ABI and API)
Removed rasqal_init() and rasqal_finish()
functions.
Added a new rasqal_world object to manage
library allocations and classes with new library
constructor/initializing function
rasqal_world *rasqal_new_world(void)
and destructor/cleanup function:
void rasqal_free_world(rasqal_world*)
The following functions now take a librdf_world*
world argument as the first argument:
rasqal_language_name_check(),
rasqal_languages_enumerate(),
rasqal_new_query(),
rasqal_query_results_formats_check (),
rasqal_new_query_results_formatter(),
rasqal_new_query_results_formatter_by_mime_type(),
rasqal_new_integer_literal(),
rasqal_new_typed_literal(),
rasqal_new_double_literal(),
rasqal_new_float_literal(),
rasqal_new_uri_literal(),
rasqal_new_pattern_literal(),
rasqal_new_string_literal(),
rasqal_new_simple_literal(),
rasqal_new_boolean_literal(),
rasqal_new_variable_literal(),
rasqal_new_decimal_literal(),
rasqal_new_decimal_literal_from_decimal()
Removed deprecated
rasqal_new_floating_literal(),
rasqal_graph_pattern_get_flags(),
rasqal_expression_foreach() functions,
RASQAL_LITERAL_FLOATING macro and
rasqal_expression_foreach_fn typedef.
Modified rasqal_triples_match struct to add a
rasqal_world* world field.
There is no more static data such as error pointers, arrays of
query languages, URI objects; it is all attached to the rasqal_world
object.
Misc changes
Fixed memory leaks in lang() expression evaluation. (Lauri Aalto)
Made several low-memory resiliance fixes in query construction and
execution. (Lauri Aalto)
Library requires raptor 1.4.17 or newer to get the newly public
raptor SAX2 API for reading SPARQL XML Results format.
Updated mpfr configure check to look for modern functions rather
than functions that are also in the older gmp-mpfr library too.
Only the first error is reported for syntax errors in lex/parse
of SPARQL and RDQL since the lack of error recovery means that the
consequent messages are of little use.
Fatal errors in SPARQL and RDQL lexer/parser no longer does an
abort, but exits via setjmp/longjmp.
Query Engine Changes
Added internal rowsource class to get rows from an execution
engine or a syntax (query result formatter).
Graph Pattern Class Changes
Modified rasqal_graph_pattern_add_sub_graph_pattern() to
have an int return value for catching allocation failures.
Query Class Changes
Modified rasqal_query_add_variable() and
rasqal_query_add_prefix() to have int return values for
catching allocation failures.
Query Results Class Changes
Updated the internals to allow construction of a query result
outside the query engine, such as from a syntax.
Added rasqal_query_results_read() to read a query
results from an iostream in some format.
Modified rasqal_query_results_formats_enumerate() to add
a flags argument with
RASQAL_QUERY_RESULTS_FORMAT_FLAG_READER and
RASQAL_QUERY_RESULTS_FORMAT_FLAG_WRITER choices to
choose formats for read or write enumeration.
Removed function
rasqal_query_results_formats_enumerate_full now handled
by rasqal_query_results_formats_enumerate().
Added rasqal_query_results_formatter_read() to read
query results from a syntax via an iostream.
Variable Class Changes
Added rasqal_new_variable_from_variable() copy
constructor.
General Changes
Many updates for better SPARQL support. Rasqal 0.9.15 passes over
92% of the DAWG SPARQL Test Suite as of 2007-11-13.
Rasqal still does not support either UNION or
GROUP and OPTIONAL remains buggy. There
remain a few other minor areas not yet completely supported such as
XSD date and XSD dateTime equality and
comparisons.
WARNING: ABI AND API CHANGE in Rasqal 0.9.16. The next
release of Rasqal will be incompatible with this one.
It will have both ABI and API changes that will require source
updates.
The shared library major soname will change from 0 to 1.
The header files will move to be installed in
PREFIX/include/rasqal such as
/usr/include/rasqal for usual installs.
The full details of the API change have not been decided but the
driving change is that using the library will be done via a new
Rasqal world object,k will now be used to working like a Redland
librdf_world. All constructors will take this world
object as an argument and all static data will be indirected from the
object. Handlers such as the uri_handler/data and error handlers
will also move to be set/get via the world object.
There are almost certainly other API changes and cleanups that
will be done, and some possibly some of the data structures may be
made internal.
Fixed issues:
SPARQL Query Language Changes
Many updates to support the SPARQL
Candidate Recommendation and
Proposed Recommendation versions of the language including:
- Added
REDUCED syntax support (no query engine support)
- Added
SAMETERM() support.
- Allowing numbers at the start of local names.
- Allowing
@lang and
^^datatype after triple-quoted literals.
- Make unary + and - work
- Remove
CONSTRUCT * that is no longer in the spec
- Removed hexadecimal literals which were never in the spec
- Made queries with the
ASK verb work again.
- Made
LANG() and DATATYPE() work to
spec on typed literals.
- Remove warning about optional SPARQL
WHERE
although it is still a dumb idea to have useless keywords.
Query Engine Changes
Many internal changes were made including refactoring the engine
core and adding of additional internal documentation for the engine
functions.
Substantial improvements were made to datatypes support:
- SPARQL / XQuery / XPath numeric type promotion is now supported,
including derived types of
xsd:integer etc.
- Added XSD
xsd:decimal implementation either using
GNU MP, MPFR, C99 _Decimal (but I have yet to find a
working implementation) or by default and inaccurately, C
doubles.
- Added XSD
xsd:dateTime initial support for validation.
- Numeric operations such as +, -, *, / and ! as well as comparisons
are now done in the appropriate datatype (which may be a promotion).
Improved the way that literal equality and comparisons work
especially with respect to datatypes. Triple pattern matching
(equality) works with RDF terms. SPARQL FILTER literal
equality and comparisons follow SPARQL rules with possible numeric
type promotion, then using RDF Term if the types are different.
ORDER comparison or DISTINCT equality
checks use RDF Term. RDQL execution uses it's own existing "stringy"
rules.
Set the query base URI.
Make queries that bind the origin (SPARQL GRAPH)
match correctly against the default graph.
Memory reduction in stack usage when evaluation expressions
(such as SPARQL FILTERs).
Public API changes
Added rasqal_home_url_string static constant.
Added rasqal_xsd_decimal class and API calls
described below.
Added a decimal part to the rasqal_literal union
value for RASQAL_LITERAL_DECIMAL types.
Added a parent_type part to the rasqal_literal when
the type can be promoted.
Added RASQAL_EXPR_SAMETERM expression
Added RASQAL_COMPARE_RDF and
RASQAL_COMPARE_URI comparison types for RDF Term
comparsion rules and allowing URI comparison (without
STR()) respectively.
Added rasqal_new_typed_literal() to make an RDF typed
literal from a type and string (no language).
Added rasqal_new_float_literal() for wrapping a C
float as XSD float.
Added new decimal literal constructor
rasqal_literal* rasqal_new_decimal_literal_from_decimal(const unsigned char *string, rasqal_ xsd_decimal* decimal)
Added rasqal_literal_datatype method to get the datatype
URI of a literal.
Added rasqal_literal_value method to get the literal
value of a literal, looking up any variables to their value.
FIXME should this not involve query results?
Added addition rasqal_triple_parts enums:
RASQAL_TRIPLE_GRAPH for just the named graph part
RASQAL_TRIPLE_SPO for subject, predicate and objects and
RASQAL_TRIPLE_SPOG for all parts including named grpah.
Decimal Class
A new rasqal_xsd_decimal class was added to handle
XSD decimals with accurate decimal arithmetic.
Constructor:
rasqal_xsd_decimal* rasqal_new_xsd_decimal(void);
Destructor:
void rasqal_free_xsd_decimal(rasqal_xsd_decimal* dec);
Methods:
double rasqal_xsd_decimal_get_double(rasqal_xsd_decimal* dec);
int rasqal_xsd_decimal_set_double(rasqal_xsd_decimal* dec, double d);
iint rasqal_xsd_decimal_set_string(rasqal_xsd_decimal* dec, const char* string);
int rasqal_xsd_decimal_set_long(rasqal_xsd_decimal* dec, long l);
int rasqal_xsd_decimal_print(rasqal_xsd_decimal* dec, FILE* stream);
char* rasqal_xsd_decimal_as_string(rasqal_xsd_decimal* dec);
char* rasqal_xsd_decimal_as_counted_string(rasqal_xsd_decimal* dec, size_t* len_p);
Numeric methods (writing to the result argument):
int rasqal_xsd_decimal_add(rasqal_xsd_decimal* result,
rasqal_xsd_decimal* a, rasqal_xsd_decimal* b);
int rasqal_xsd_decimal_subtract(rasqal_xsd_decimal* result,
rasqal_xsd_decimal* a, rasqal_xsd_decimal* b);
int rasqal_xsd_decimal_multiply(rasqal_xsd_decimal* result,
rasqal_xsd_decimal* a, rasqal_xsd_decimal* b);
int rasqal_xsd_decimal_divide(rasqal_xsd_decimal* result,
rasqal_xsd_decimal* a, rasqal_xsd_decimal* b);
int rasqal_xsd_decimal_negate(rasqal_xsd_decimal* result,
rasqal_xsd_decimal* a);
Comparison methods:
int rasqal_xsd_decimal_compare(rasqal_xsd_decimal* a, rasqal_xsd_decimal* b);
int rasqal_xsd_decimal_equals(rasqal_xsd_decimal* a, rasqal_xsd_decimal* b);
int rasqal_xsd_decimal_is_zero(rasqal_xsd_decimal* d);
Query Results Formatter Class Changes
Updated to the 4th version of the SPARQL XML Results format by
removing the ordered and distict
attributes. Removed support for all the earlier versions 1 to 3.
roqet Utility Changes
Added -D / --data options for specifying
data URis for the default graph and -G /
--named for URIs of named graphs (the existing
-s is a also a synonym for the latter).
Other Changes
Many internal fixes and cleanups after failures so that memory is
not lost and/or rasqal does not crash. These many changes were
primarily made by Lauri Aalto.
Several portability fixes for helping with low-memory, embedded
systems and using a compiler that is not gcc.
The SPARQL test runner check-sparql was improved to
read the SPARQL XML Results format (but not via
XML::Simple because it is insanely complex and
counterintuitive), handle DAWG test manifests and generate EARL
reports. It also has new help and usage messages.
General Changes
Added syntax and API support (but no query engine support)
for experimental extensions to SPARQL called
LAQRS:
LAQRS Adds to Querying RDF in SPARQL.
Updated the query results formatter to allow better introspection
of supported formats.
Fixed issues:
LAQRS Adds to Querying RDF in SPARQL (LAQRS)
LAQRS is experimental and Rasqal provides only syntax and
API support (but no query engine support) for:
DELETE via query verb RASQAL_QUERY_VERB_DELETEEXPLAIN as a keyword allowed before any query. Returned by rasqal_query_get_explain()INSERT via query verb RASQAL_QUERY_VERB_INSERTCOUNT() and COUNT(*) via new expressions RASQAL_EXPR_COUNT and RASQAL_EXPR_VARSTARSELECT expression AS variable via the new expression field of rasqal_variableGROUP BY results via rasqal_query_get_group_conditions_sequence() and rasqal_query_get_group_condition() and new expressions RASQAL_EXPR_GROUP_COND_ASC and RASQAL_EXPR_GROUP_COND_DESC
Repeating THERE IS NO QUERY ENGINE SUPPORT FOR ANY OF THE ABOVE
LAQRS is not enabled by default in Rasqal (unless using
maintainer mode or building from Subversion). To enable it,
configure Rasqal like this:
$ ./configure '--enable-query-languages=sparql rdql laqrs'
...
Rasqal build summary:
RDF query languages available : rdql sparql
RDF query languages enabled : sparql rdql laqrs
Triples source : raptor 1.4.15
$
The API changes for LAQRS are as follows:
Added new query verbs RASQAL_QUERY_VERB_DELETE and
RASQAL_QUERY_VERB_INSERT
Added a constructor to create a constant or 0-operand expression
(for COUNT):
rasqal_expression* rasqal_new_0op_expression(rasqal_op op);
Added a query method to get the explain flag:
int rasqal_query_get_explain(rasqal_query* query);
Added a query method to get the 'group by' condition expressions:
raptor_sequence*
rasqal_query_get_group_conditions_sequence(rasqal_query* query);
rasqal_expression*
rasqal_query_get_group_condition(rasqal_query* query, int idx);
Added rasqal_expression expression types:
RASQAL_EXPR_GROUP_COND_ASC for group condition ascending.RASQAL_EXPR_GROUP_COND_DESC for group condition descending.RASQAL_EXPR_COUNT for select COUNT()RASQAL_EXPR_VARSTAR for select COUNT(*)
rasqal_variable now has
a rasqal_expression* field expression.
Configuration and Build Changes
The pkgconfig rasqal.pc file and the rasqal-config
script now separates directly linked shared libraries and indirectly
linked ones. This prevents unnecessary references to libraries. The
regular libraries includes -L plus -lrasqal and the
dynamic and static libraries are available with:
pkgconfig rasqal --static --libsrasqal-config --libs --private-libs
So for example to statically link with rasqal, use either:
$ cc .. -o foo foo.c `pkgconfig rasqal --static --libs`
$ cc .. -o foo foo.c `rasqal-config --libs --private-libs`
Query Results Formatter Changes
Made it easier to discover and create of query results in a syntax
by using a MIME Type.
Added query results formatter constructor by required mime type:
rasqal_query_results_formatter*
rasqal_new_query_results_formatter_by_mime_type(const char *mime_type);
Added a method to return the mime type of a selected formatter:
const char*
rasqal_query_results_formatter_get_mime_type(
rasqal_query_results_formatter *formatter);
Added another query results formatter static method to enumerate
possible results formats, their names, labels and (new) mime type.
int
rasqal_query_results_formats_enumerate_full(const unsigned int counter,
const char **name, const char **label,
const unsigned char **uri_string, const char **mime_type);
Added a static method to check for support for a query results
format.
int rasqal_query_results_formats_check(const char *name,
raptor_uri* uri, const char *mime_type);
SPARQL Query Language Changes
Updated for the
SPARQL Query Language for RDF, W3C Working Draft 26 March 2007
- Added
REDUCED token. This entailed changing the
distinct flag from a boolean to a mode.
rasqal_query_get_distinct and
rasqal_query_set_distinct now takes a mode (0, 1
DISTINCT, 2 REDUCED) rather than the former boolean flag.
There is no query engine support for REDUCED at present.
Query Engine Changes
Added the possibility that a query's native result is a syntax
(rather than natively bindings, boolean or triples) and added
a method to check for that:
int rasqal_query_results_is_syntax(rasqal_query_results* query_results);
Many query engine internal changes, but these remain unsupported:
OPTIONAL graph pattern (partially working), GROUP graph pattern (no
support), UNION graph pattern (no support) and new SELECT
REDUCED (no support).
roqet Utility Changes
roqet can use -r to generate a chosen result syntax
for bindings results or triples (using raptor).
roqet now generates namespace declarations for triples when
serializing output. The result is that they are used when the
serializer handles them such as generating RDF/XML (Abbreviated)
or Turtle.
Other Changes
rasqal_expression lost the unused
rasqal_variable* field variable
Added exported variables to return the license string
in rasqal_license_string
and home page in rasqal_home_url_string
General Changes
Added a new rasqal_query_results_formatter class.
Many internal query engine changes, mostly to separate query and
query_results internals so that eventually the run-time execution
context is entirely separated from the static query structure.
Added query features system with one initial feature
RASQAL_FEATURE_NO_NET.
Configuration and Build Changes
Allow shell variable LEX to be set to things that
aren't exactly flex Recommend flex 2.5.33 and update
configure to point at the main flex site whichq finally gets 2.5.33
after 9 years.
PKGCONFIG vars not substituted
correctly in configure.ac. Remove @LDFLAGS from rasqal.pc.in.
Fixes Issue#0000098.
Win32 build fixes.Correct win32 static linking of rasqal.
(Fixes Issue#0000100)
and include float.h and #define isnan on win32.
(Fixes Issue#0000111).
In maintainer mode, add all the supported compiler -W
warning flags to the CFLAGS.
Declare several rasqal functions with GCC printf-formatting
attributes when using a new enough GCC.
Remove broken debug messages.
#0000131.
SPARQL Query Language Changes
Added labels to grammar tokens using bison to give better error messages.
Fix looking for EOF in an unsigned variable since it may be negative
on some systems.
The query engine now implements SPARQL GRAPH matching.
RDQL Query Language Changes
Added labels to grammar tokens using bison to give better error messages.
Fix looking for EOF in an unsigned variable since it may be negative
on some systems.
Query Engine Changes
The query engine now implements SPARQL GRAPH matching.
Merge only all adjacent sequences of basic graph pattern triples, not
anything with triples such as optional BGP triples.
Fixes Issue#0000080.
When an exact triple match is present, do not execute a query forever.
Fixes Issue#0000094.
Fail if a variable argument to LANG() has an
undefined value rather than try to execute a NULL pointer.
Fixes Issue#0000113.
Add query / query_results link early so reference counting is done right.
Fixes Issue#0000095.
Report failure as well as query finished when an error occurs
during making results.
Fixes Issue#0000118.
Added a hack to check an outer constraint expression.
Fixes Issue#0000129.
Free origins (GRAPH nodes) in triples to prevent memory leak.
Fixes Issue#0000133.
Query API Changes
Added a new rasqal_query_results_formatter class to
format librdf_query_results into a syntax. Also added
a rasqal_query_results_formats_enumerate() function to
enumerate all the supported formats. The query results
method rasqal_query_results_write() was changed to use
this class internally.
Added a new feature system to allow setting parameters on
the query parser/engine. Initially have one
feature RASQAL_FEATURE_NO_NET that prevents
network requests during a query execution.
Added functions:
rasqal_features_enumerate,
rasqal_get_feature_count,
rasqal_feature_from_uri,
rasqal_feature_value_type,
rasqal_query_set_feature,
rasqal_query_set_feature_string,
rasqal_query_get_feature,
rasqal_query_get_feature_string.
roqet gained a -f
/ --feature option to set query features.
General Changes
Added JSON as a query results
format based on the
Serializing SPARQL Query Results in JSON
draft.
Added query writing to a raptor_iostream which allows
reading in one query language and writing in another. The only
useful consequence of this now is that it enables roqet
to become an RDQL to SPARQL translator.
Rasqal now requires raptor
1.4.9 or newer.
Configuration and Build Changes
Now using subversion.
roqet utility Changes
Altered the -d (--dump-query) option to
now take an argument of the query format to dump. The values it can
take are debug, structure or
sparql.
To convert a query from RDQL to SPARQL, use:
roqet -q -i rdql -d sparql -n query.rdql > query.sparql
Added -r json for JSON
query results output based on the draft defined in the
Serializing SPARQL Query Results in JSON draft
SPARQL Query Language Changes
Updated to match
SPARQL Query Language for RDF, W3C Candidate Recommendation 6 April 2006.
All DAWG syntax tests now pass.
The update includes near alignment with SPARQL grammar term names
except where the flex/bison approach diverged.
Updated SPARQL tests from DAWG CVS
Finally removed long deprecated ASC[] and
DESC[] syntax.
RDQL Query Language Changes
Handle empty regex //
Fixes Issue#0000071
Query Engine Changes
Some updates to handle latest changes to SPARQL grammar.
Added RASQAL_EXPR_REGEX 3-arg operation to match
the SPARQL regex() 2/3-arg function.
Many internal changes to move more of the query execution state
from inside rasqal_query to
inside rasqal_query_results and related structures.
This is not yet complete but when done, you will be able to execute
the same query more than once at the same time.
Query API Changes
Added rasqal_query_write to write a query
structure into a syntax onto a raptor_iostream. Implements
writing SPARQL format with format URI NULL,
http://www.w3.org/TR/rdf-sparql-query/
or
http://www.w3.org/TR/2006/CR-rdf-sparql-query-20060406/
Added a JSON
SPARQL query results format with format URI identifier
http://www.w3.org/2001/sw/DataAccess/json-sparql/
based on the draft defined in
http://www.w3.org/2001/sw/DataAccess/json-sparql/
Implemented document with version
alt-ser-sparql.rst,v 1.3 2006/02/16 16:03:08 k Exp.
rasqal_query_get_all_variable_sequence was corrected to match the
definition - return all variables, not just the bound (SELECTed) ones.
Fixes Issue#00000079.
Added rasqal_query_get_anonymous_variable_sequence to return
only anonymous variables after change above.
Added rasqal_graph_pattern_get_index to get the
absolute index of a graph pattern in a graph.
IOstream class Changes
Added
rasqal_query_iostream_write_escaped_counted_string and
rasqal_query_escape_counted_string
to format an escaped string suitable for using inside a query.
Documentation Changes
Updated roqet.1 for --exec option and new usages.
General Changes
Duplicated SELECT variables are now detected, give a
warning and are removed.
Rasqal now requires raptor
1.4.8 or newer to get the guess parser that uses URI/name
and mime type returned from protocol request (if available) to choose
the correct parser.
Added an internal rasqal_map key : value map for use
with result duplicate detection and ordering.
A major source code regoranisation moved all library source code
to the src/ dir, roqet to utils/ and other
documentation to docs/. This should only affect
packagers, not any functionality.
Many more function documentation were added to the sources for use
by gtk-doc.
SPARQL Query Language Changes
Updated to the
SPARQL Query Language for RDF W3C Working Draft 23 November 2005:
- Added
isIRI keywords.
- Updated the name definitions to allow initial _ in variable names.
- Changed the decimal and double literal syntax.
- Allow negative numeric literals.
- Change the AND and OR logic when an error is present.
Added a post 2005-11-23 SPARQL WD syntax change: added
langMatches operator and initial query engine support.
Invalid \uHHHH and
\UHHHHHHHH hex escapes and floating point
number formats are detected and warned.
Updates to the query engine make DISTINCT
and ORDER BY now work, including with LIMIT.
The lexer now counts line numbers correctly over multi-line
comments.
Updated changes to the valid characters allowed in SPARQL names
for variable, prefix and QNames.
RDQL Query Language Changes
The lexer now counts line numbers correctly over multi-line
comments.
Query Engine Changes
When query result sorting is used with limit
(SPARQL LIMIT) and offset, they now work correctly,
performing the limit and offset after ordering the result. This
matches the SPARQL query result semantics.
The query engine now implements distinct results
(SPARQL DISTINCT) including with ordering
(SPARQL ORDER BY).
More cases with optional graph patterns (SPARQL
OPTIONALs) are now executed correctly.
Note: this does not mean all cases work, there are known
problems with executing optional clauses.
Added types for xsd:float (C float)
and xsd:double (C double); xsd:decimal
(handled as a string) and xsd:datetime (as a string).
Fixed (a compare b) between integers and doubles to be the right sign.
Do not promote literals early on in comparisons to strings "perl
style" but do the best type-based comparsion as late as possible.
Query API Changes
Added rasqal_new_double_literal.
Added rasqal_graph_pattern_visit and type for visitor
function rasqal_graph_pattern_visit_fn.
Added rasqal_new_expression_from_expression.
Added rasqal_expression_visit and type for visitor
function rasqal_expression_visit_fn.
Deprecated function rasqal_new_floating_literal replaced by
new rasqal_new_double_literal.
Deprecated function rasqal_expression_foreach,
replaced by new rasqal_expression_visit.
Function rasqal_expression_evaluate gains a flag
argument of new enum rasqal_compare_flags.
Added enum rasqal_compare_flags flags for
rasqal_expression_evaluate or
rasqal_literal_compare. Type
RASQAL_COMPARE_XQUERY can be used with
to ask for use of XQuery comparison and type promotions.
Added rasqal_literal types:
RASQAL_LITERAL_DECIMAL,
RASQAL_LITERAL_DATETIME,
RASQAL_LITERAL_DOUBLE (replacing deprecated
RASQAL_LITERAL_FLOATING) and
RASQAL_LITERAL_FLOAT. Reordered the
rasqal_literal types in the enum.
The enum types in rasqal_literal_type were reordered
to make them match sparql type promotion.
roqet utility program changes
roqet gains -e/--exec option to execute a query
string directly rather than via a file or URI containing the query.
Now writes out XML results format in format with version URI
http://www.w3.org/2005/06/sparqlResults and short name
"xml". The previous version is available with short name "xml-v2".
The latest version now writes ordered
and distinct boolean-valued attributes on
the results element.
Configuration Changes
The autogen.sh script for building from CVS was revamped to be
more modular.
configure now takes an --enable-gtk-doc
option to enable building of the documentation using the
gtk-doc utility. It is by default enabled only if the
utility is available.
Documentation Changes
The GNOME gtk-doc program is now used to
automatically extract documentation from source comments into
reference documentation. This is then merged with templates and
additional documentation to provide a reference manual for rasqal
as XML document which is turned into HTML along with GNOME devhelp
support.
This new documentation intended to replace the librasqal manual
page/web page as easier to read document with scope for better
expanding with more detail of rasqal including examples and tutorial
information.
The librasqal
manual page will continue to contain the summary information for the
present.
General Changes
The query engine now supports ordering query results, in SPARQL
this is the ORDER BY clause.
SPARQL Query Language Changes
The SPARQL parser now passes (accepts) all the 70+
SyntaxFull tests in the RDF Data Access Working Group (DAWG)
test suite for SPARQL. This mostly means accepting optional
punctuation in some places.
Sorting results with ORDER BY now partially works
however comparison is not done with the SPARQL literal comparison
rules (after XQuery) but using the existing RDQL-style "string-y"
comparisons.
Allow <> as a URI.
The SPARQL parser now accepts some changes made by the DAWG after
the last published working draft:
SPARQL Query Language for RDF,
W3C Working Draft, 19 April 2005. This includes:
- In
ORDER BY
ASC(expression) replaces ASC[...],
DESC(expression) replaces DESC[...],
and it also accepts ORDER BY (expression).
ORDER BY func()
[] can be used in the triple predicate position
as an anonymous existential variable- Enforce that ASK queries cannot use
ORDER BY,
LIMIT or OFFSET
Omitting WHERE gives a warning. Don't do that!
Query Engine Changes
The query engine now allows sorting of results (ORDER BY
in SPARQL). It performs comparisons using the existing RDQL style
and does not yet support the SPARQL literal comparison rules. Sorting
can be done by a sequence of expressions, ascending or descending.
If the final result is equality, the object pointers are used.
Note: removal of duplicates is not supported yet.
Some test code for datatypes support was added, not enabled by
default and not yet useful.
Query API Changes
Removed functions deprecated in 0.9.9.
Added rasqal_graph_pattern_operator enumeration with
values for the main SPARQL graph patterns, graph pattern class method
rasqal_graph_pattern_get_operator and graph pattern
utility function rasqal_graph_pattern_operator_as_string
Modified the type of the final argument of
rasqal_new_graph_pattern_from_sequence and
rasqal_graph_pattern_add_triples from an integer to a
rasqal_graph_pattern_operator enumeration.
Deprecated function rasqal_graph_pattern_get_flags
now always returning 0 replaced by the graph pattern operator
functions listed above .
roqet utility program changes
Removed deprecated flags -f and -o
General Changes
SPARQL is now the default query language
Added a signing memory debugging system to aid checking when
rasqal-allocated memory is freed in another library or vice-versa
enabled by --with-memory-signing configure option
(defaults to on in maintainer mode).
Fixed a few internal malloc/frees to use RASQAL_MALLOC / RASQAL_FREE
so that the above signed memory system worked.
SPARQL Query Language Changes
Grammar updated to follow the
SPARQL Query Language for RDF,
W3C Working Draft, 19 April 2005. This changes many parts of the syntax:
- Turtle/N3 style for triples with abbreviations
{ ... } around triple patternsOPTIONAL instead of []GRAPH replaces SOURCEFROM NAMED replaces LOADFILTER replaces ANDREGEX replaces ?var =~ /match/flags
and !~- Added
LIMIT, OFFSET and
ORDER BY with ASC[] and DESC[]
- Changed function syntax to remove
&
- Removed old operator tokens:
ne, eq, ==
(Note: the query engine does not support sorting amongst other
recently added SPARQL features)
SPARQL keywords are now case independent rather than just upper
or lowercase.
Added """long literals""" after N3 (and soon, Turtle)
and '''long literals''' for SPARQL only.
Added many SPARQL tests from DAWG most not yet approved by the
working group. Not all pass either because not implemented or
known bugs.
Added the revised
SPARQL Query Results XML Format (the latest version not yet published)
support to rasqal_query_results_write when called with
format URI http://www.w3.org/2001/sw/DataAccess/rf1/result2.
Query Engine Changes
Uses the query results limit and offset information to skip
initial results (offset) and provide a maximum number of results (limit).
Moved some engine-specific operations from RDQL and SPARQL parser.
Added internal rasqal_formula class for the Turtle
part of the SPARQL parser
Deprecated the rasqal_triples_source
factory method new_triples_match. It is replaced by a
new method init_triples_match and will be removed from
the next release.
Query API Changes
Added bnode identifier generation functions:
rasqal_query_set_default_generate_bnodeid_parameters,
rasqal_query_set_generate_bnodeid_handler based on the
raptor API for generating blank node identifiers in the Turtle/N3
triple style.
Added order_conditions_sequence to the query
structure to store query ordering conditions and added access methods
rasqal_query_get_order_conditions_sequence and
rasqal_query_get_order_condition to read the resulting
expressions.
Added expressions for SPARQL ordering conditions:
RASQAL_EXPR_ORDER_COND_ASC,
RASQAL_EXPR_ORDER_COND_DESC and
RASQAL_EXPR_ORDER_COND_NONE.
Added types for variables in two version - normal and anonymous
with an new enum rasqal_variable_type and
rasqal_new_variable_typed to allow creating them.
Completed the distinct/limit and offset get/set methods by adding:
rasqal_query_set_distinct,
rasqal_query_set_limit,
rasqal_query_get_offset and
rasqal_query_set_offset
Deprecated the rasqal_triple flags field - the value
RASQAL_TRIPLE_FLAGS_EXACT was only used in internals of
the execution engine. The value
RASQAL_TRIPLE_FLAGS_OPTIONAL was never used. Optionals
are now noted on graph patterns. Deprecated
rasqal_triple_set_flags and
rasqal_triple_get_flags.
Added enum rasqal_query_verb for the main query verbs:
RASQAL_QUERY_VERB_SELECT
RASQAL_QUERY_VERB_CONSTRUCT
RASQAL_QUERY_VERB_DESCRIBE and
RASQAL_QUERY_VERB_ASK.
Added method rasqal_query_get_verb to access the verb.
Added rasqal_query_get_query_graph_pattern to get the
top graph pattern.
Added rasqal_query_get_wildcard to get the query verb
wildcard flag such as with SPARQL SELECT *
Added rasqal_query_get_construct_triples_sequence and
rasqal_query_get_construct_triple to get the triples
made from a SPARQL CONSTRUCT query.
roqet utility program changes
Updated roqet to include better query structure walking with
-w / --walk including listing query verb,
distinct, limit, offset flags, construct triples and easier to read
groupings of graph patterns and triples.
Deprecated roqet arguments -f / --format
and -o / --output in place of
-r / --results as both choose the query
results format.
SPARQL is now the default query language for roqet.
SPARQL Query Language Changes
Grammar updated to follow the
SPARQL Query Language for RDF,
W3C Working Draft, 17 February 2005.
Added support for casting in constraint expresions for datatyped literals
with the syntax qname(literal)
such as xsd:decimal("10").
Added named graphs parsing with LOAD and note that
UNION cannot be handled yet, SOURCE and
[...] syntax for optionals are deprecated.
Query Engine Changes
Engine now operates over a hierarchy of
rasqal_graph_pattern objects, where at the root the
query has a single query graph rather than a sequence of
graph patterns. The query graph contains the former sequence of
graph patterns.
Constraints can be applied to any graph pattern, not just at the
top level of a query.
Added casting expressions type RASQAL_EXPR_CAST
and constructor rasqal_new_cast_expression.
Fixed setting of a triple origin (SPARQL GRAPH) which
was not working in 0.9.7
xsd:boolean RDF literals are now promoted into
internal RASQAL_LITERAL_BOOLEAN typed
rasqal_literal like for XSD integer and double.
The query engine uses the named graph information when evaluating
queries, passing it to the rasqal_triples_match factory
methods either implemented with raptor or redland as a
rasqal_triples_source_factory and returning them
as results of variable bindings.
Query API Changes
Added no-arg constructor
rasqal_new_graph_pattern
Added method
rasqal_graph_pattern_add_triples
to add triples to an existing graph pattern.
Added methods
rasqal_graph_pattern_add_constraint,
rasqal_graph_pattern_get_constraint_sequence and
rasqal_graph_pattern_get_constraint
to add constraints to a graph pattern.
Added method
rasqal_graph_pattern_add_sub_graph_pattern
to add a sub-graph pattern to a graph pattern.
Added a Data Graph class with constructor
rasqal_new_data_graph, destructor
rasqal_free_data_graph and debug method
rasqal_data_graph_print.
Added query methods for data graphs:
rasqal_query_add_data_graph,
rasqal_query_get_data_graph_sequence,
rasqal_query_get_data_graph.
Deprecated query methods
rasqal_query_add_constraint,
rasqal_query_get_constraint_sequence
rasqal_query_get_constraint,
rasqal_query_add_source,
rasqal_query_get_source_sequence and
rasqal_query_get_source. These will be removed in the
next release.
Removed functions deprecated in previous version:
rasqal_query_get_variable_sequence
and rasqal_query_add_triple.
General Changes
Fix a resource clean up when query results are either not read at
all or not fully exhausted. This caused a problem in Redland when it
held on to MySQL database handles despite a query having ended.
Added option -n/--dryrun to roqet to stop after
preparing the query. Added option -w/--walk-query to
walk and print the query using the graph API.
New build configuration and portability fixes for win32 (John Barstow)
Portability fixes for win32 - define RASQAL_INLINE
and use it as for raptor. (Dave Viner)
Make rasqal tests work when building against raptor in a sibling
source tree.
Query Engine Changes
Added a graph pattern API with rasqal_graph_pattern
typedef and rasqal_pattern_flags enum with value
RASQAL_PATTERN_FLAGS_OPTIONAL to allow complete
walking of the query structure.
Two new methods to the query class were added to support this:
rasqal_query_get_graph_pattern_sequence to get the
raptor_sequence of graph patterns in a query and
rasqal_query_get_graph_pattern to get individual an
graph pattern by index.
The new graph pattern methods added are:
rasqal_graph_pattern_get_triple to get a
raptor_triple inside a graph pattern.rasqal_graph_pattern_get_sub_graph_pattern_sequence to
get the raptor_sequence of sub-graph patterns.rasqal_graph_pattern_get_sub_graph_pattern to get
a sub-graph pattern inside a graph pattern by index.rasqal_graph_pattern_get_flags to get a graph
pattern's flags.rasqal_graph_pattern_print to print a graph
pattern in a debug form.
Deprecated rasqal_query_add_triple as it doesn't
construct the graph patterns and is of little use as it does not
build the correct query structures.
Added query API methods to get the bound and all variables
in a query: rasqal_query_get_bound_variable_sequence
and rasqal_query_get_all_variable_sequence respectively.
Deprecated rasqal_query_get_variable_sequence as
too ambiguous.
With the aid of gcc -Wswitch-enum, found and fixed
cases where switch on enumerated values were missing cases. The
remaining cases return failure or an error message rather than
abort(). This fixed a crash when comparing for equality a variable
?x with a blank node value and an interger.
Deleted RASQAL_EXPR_PATTERN as it was never used.
Added rasqal_query_get_distinct to get a
query-specified distinct results flag.
Added rasqal_query_get_limit to get a query-specified
limit on the number of results.
SPARQL Query Language Changes
Updated some of the SPARQL syntax to match the changes in the
SPARQL Query Language for RDF
W3C Working Draft of 17 February 2005. Added GRAPH
replacing SOURCE and WITH replacing
FROM. Added warnings about using the older forms
and about using [...] instead of
OPTIONAL.
Added recording of DISTINCT and LIMIT
in the query structures but not yet used by the query engine.
RDQL Query Language Changes
None.
General Changes
Fix a bug in writing a query result to XML when blank nodes are
used. Now also correctly uses the base URI when pass in to the
writing method.
Added support for three types of query result - bindings (the only
one in previous versions), an RDF graph and a boolean. Added
rasqal_query_results methods to test the type of the
result: rasqal_query_results_is_bindings,
rasqal_query_results_is_boolean and
rasqal_query_results_is_graph.
Added
rasqal_query_results_get_triple
to get current triple as a raptor_statement
and rasqal_query_results_next_triple to move to the next triple.
Added
rasqal_query_results_get_boolean
to get a boolean query result value.
Added rasqal_triple copy constructor
rasqal_new_triple_from_triple.
Query Engine Changes
Constructs an RDF graph result as a sequence of triples. This
enables the SPARQL CONSTRUCT form to work.
Can return a boolean result indicating that there were variable
binding results, but not returning them. This enables the SPARQL
ASK form to work.
Added a new function expression - rasqal_op enum value
RASQAL_EXPR_FUNCTION, added new name and
args fields to the rasqal_expression
structure and added rasqal_new_function_expression to
construct this expression.
Added new 1-argument expression RASQAL_EXPR_STR
returning a string version of the expression.
Added new 1-argument expressions operating on RDF literals:
RASQAL_EXPR_LANG returning the language string of an RDF literal,
RASQAL_EXPR_DATATYPE returning the datatype URI of an RDF literal.
Added new 1-argument testing expressions returning booleans:
RASQAL_EXPR_BOUND true if the variable argument is bound to a value,
RASQAL_EXPR_ISURI true if the argument is a URI,
RASQAL_EXPR_ISBLANK true if the argument is a blank node and
RASQAL_EXPR_ISLITERAL true if the argument is an RDF literal.
Fixed a problem in optional results returning extra results
with no new bindings.
SPARQL Query Language Changes
The SPARQL Parser now allows UTF-8 and \u, \U in prefixes and
QNames.
Now supports CONSTRUCT and ASK
queries using the updated query engine features.
OPTIONAL can now be used wherever [ ...
] could be used (parser bug fix).
Now supports the SPARQL built-in functions
STR() returning a string version of the expression,
LANG() returning the language string of an RDF literal,
DATATYPE() returning the datatype URI of an RDF literal,
BOUND() testing if a variable is bound,
ISURI() testing if an expression is a URI,
ISBLANK() testing if an expression is a blank node and
ISLITERAL() testing if an expression is an RDF literal.
Now supports SPARQL BASE directive for setting the
base URI of a query. This is experimental and may not be in
the next version or may not be in the final SPARQL language.
The parser now expands QNames correctly when used in literals like
"blah"^^xsd:string.
RDQL Query Language Changes
The RDQL Parser now allows UTF-8 and \u, \U in prefixes and
QNames. This makes RDQL testsuite tests S-03, S-04 and S-05 work.
A release with major changes internal to the query engine to
operate over graph patterns instead of sequences of triple patterns
and to add execution of optional graph patterns. Additionally the
query results can now be written in a recognised XML format.
This version of Rasqal requires
Raptor 1.4.4.
Core Changes
Added a rasqal_graph_pattern class for handling
matching a graph pattern (set of triple patterns) in an
rasqal_query. RDQL only has one of these wheras SPARQL
may have many, and they may be nested (this may change, as SPARQL is
under development).
Added rasqal_query_results_write method to write
variable binding query results to a raptor_iostream in
the XML format defined by
SPARQL Variable Binding Results XML Format, W3C Working Draft, 21 December 2004.
Query Engine Changes
Updated the query engine to operate over graph patterns rather
than a single sequence of triple patterns. The graph patterns may be
optional, which is used to implement SPARQL optionals. Nested graph
patterns are constructed but cannot yet be executed.
Added a unary minus expression type.
Improved the type promotion for expression evaluation. Try to
evaluate strings as doubles or integers if the operation contains one
double or integer respectively.
Fixed a memory leak with string matches/non-matches.
SPARQL Query Language Changes
Optional graph patterns OPTIONAL and
[ ... ] now work.
Added the { ... } group syntax and
removed the ( ... ) form.
$ was added as an allowed variable prefixes.
A warning was added to show SOURCE * is ignored.
Added the UNION keyword, unsupported.
Rasqal now passes the
DAWG
SPARQL
test cases:
Optional triples (dawg-opt-query-001, dawg-opt-query-002,
dawg-opt-query-003, dawg-opt-query-004)
and examples from query WD (sparql-query-example-2.1a,
sparql-query-example-2.2a, sparql-query-example-2.3a,
sparql-query-example-2.4a, sparql-query-example-3)
Allow UTF-8 qname prefixes and check name against XML name
constraints.
Recover lexer state from errors in regexes.
Terminate the lexer on a syntax error, rather than produce
multiple errors.
RDQL Query Language Changes
The lexer now handles UTF-8 qname prefixes, enabling RDQL
testsuite test S-02 to pass.
Allow UTF-8 qname prefixes and check name against XML name
constraints.
Recover lexer state from errors in regexes.
Terminate the lexer on a syntax error, rather than produce
multiple errors.
Pass on raptor parser errors to rasqal's error routines and
upwards.
Clean up several memory allocations when a query fails to prepare
or execute fully.
Fixed lexer jams when a query contained an illegal
variable name after a '?'.
Fixed lexer crashes when a query ended in a regex pattern like
/abc/.
Tidied up the testing framework so 'make distcheck' works.
Rasqal's License was changed from LGPL 2.1/MPL 1.1 to
LGPL 2.1/Apache 2
Added support for the
SPARQL Query Language for RDF,
W3C Working Draft, 12 October 2004
from the W3C RDF Data Access Working Group (DAWG).
The support is at the basic syntax level - token lexer and grammar parser
which passes the first simple tests from the proposed
DAWG testcases. No additional query engine support has been added for SPARQL
features that are not supported by RDQL. The
Rasqal to do list
contains full details of the implementation state.
Queries can now be prepared and then executed multiple times.
Added configure --enable-query-languages option with
rdql and sparql as the choices.
Thanks to Chris Pointon for several patches to make Rasqal easier
to build under Win32. Applied with some modifications. Renamed the
RDQL and SPARQL syntax tokens ERROR to ERROR_TOKEN to help.
Added experimental support for querying multiple sources; the same
query is executed over each source in turn. Also added some support
for returning the source URI which is not yet enabled as this feature
is in flux in the DAWG work. This may change or be removed in future
versions.
roqet can specify a data source URI on the command
line with -s / --source) URI for
queries executing against an implicit model.
Added the
DAWG SPARQL test cases
driven from the manifest.n3 format. Created tests from the examples
in the working draft.
Added an experimental XML result format for bindings, based on
DAWG work. Enabled in roqet with -o xml.
This is very likely to change or replaced in future versions.
Added roqet argument -d /
--dump-query to dump the processed query, rather than
do it by default (0.9.2 and earlier).
roqet can now read queries from URIs, using
the raptor_www class to do the retrieval.
Fixed the configure checks for a posix regex
function regcomp to correctly discover it is present.
Internal changes
Added support for declaring prefixes for XML-style QNames both
before and after their use.
The struct rasqal_prefix gained a
declared field.
The struct rasqal_triple gained an origin field; not
used at present but intended to support work on tracking triple
provenance such as provided by Redland Contexts.
Added methods rasqal_triple_set_origin and
rasqal_triple_get_origin to support the above.
struct rasqal_triple_meta now takes a 4-array of
bindings, the fourth being the origin.
Exported function rasqal_set_triples_source_factory
publically as originally intended.
This release made minor portability fixes for building with
C++ and Win32 (untested).
Several functions changed their parameters or return values from
char* to unsigned char* or const unsigned char* to reflect the
actual use.
Changed to return a const unsigned char*:
rasqal_literal_as_string
Changed to take const unsigned char* (or add
const):
rasqal_new_floating_literal
rasqal_new_pattern_literal
rasqal_new_prefix
rasqal_new_simple_literal
rasqal_new_string_literal
rasqal_new_variable
rasqal_query_has_variable
rasqal_query_results_get_binding_name
rasqal_query_results_get_binding_value_by_name
rasqal_query_results_get_bindings
rasqal_query_set_variable
This release changed the way that results were returned. A new
rasqal_query_results class was created. This allows for
a clean separation of the two concepts allowing multiple form of the
results to be retrieved as methods of the query_results class, rather
than the query class. The only form of results currently available
is variable bindings, but RDF graphs will be returned in future,
as a set of triples in a serialised form.
The execution method rasqal_query_execute was changed
to return a new object of that class rather than an int
success or failure.
The following methods of the rasqal_query class
were renamed and moved to the new rasqal_query_results
class:
| 0.9.0 name | 0.9.1+ name |
rasqal_query_get_result_count | rasqal_query_results_get_count |
rasqal_query_next_result | rasqal_query_results_next |
rasqal_query_results_finished | rasqal_query_results_finished |
rasqal_query_get_result_bindings | rasqal_query_results_get_bindings |
rasqal_query_get_result_binding_value | rasqal_query_results_get_binding_value |
rasqal_query_get_result_binding_name | rasqal_query_results_get_binding_name |
rasqal_query_get_result_binding_by_name | rasqal_query_results_get_binding_value_by_name |
rasqal_query_get_bindings_count | rasqal_query_results_get_bindings_count |
A new rasqal_free_query_results destructor was created
to delete the query results. (There is no public constructor).
Other minor bugs were fixed such as multiple constraints now being
ANDed and not ORed, and adding defensive code for when queries fail
and results methods are invoked.
It is all new.
