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.
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.
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.
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.
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.
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.
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.
Now using subversion.
roqet utility ChangesAltered 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
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.
Handle empty regex //
Fixes Issue#0000071
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.
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.
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.
Updated roqet.1 for --exec option and new usages.
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.
Updated to the SPARQL Query Language for RDF W3C Working Draft 23 November 2005:
isIRI keywords.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.
The lexer now counts line numbers correctly over multi-line comments.
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.
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 changesroqet 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.
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.
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.
The query engine now supports ordering query results, in SPARQL
this is the ORDER BY clause.
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:
ORDER BY
ASC(expression) replaces ASC[...],
DESC(expression) replaces DESC[...],
and it also accepts ORDER BY (expression).
ORDER BY func() is accepted although at
present no extension function support is available that could use it.
[] can be used in the triple predicate position
as an anonymous existential variableORDER BY,
LIMIT or OFFSETOmitting WHERE gives a warning. Don't do that!
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.
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 changesRemoved deprecated flags -f and -o
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.
Grammar updated to follow the SPARQL Query Language for RDF, W3C Working Draft, 19 April 2005. This changes many parts of the syntax:
{ ... } around triple patternsOPTIONAL instead of []GRAPH replaces SOURCEFROM NAMED replaces LOADFILTER replaces ANDREGEX replaces ?var =~ /match/flags
and !~LIMIT, OFFSET and
ORDER BY with ASC[] and DESC[]&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.
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.
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 changesUpdated 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.
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.
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.
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.
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.
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.
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.
None.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Copyright (C) 2004-2006 Dave Beckett
Copyright (C) 2003-2005 University of Bristol