view ChangeLog @ 1168:c003d2c1a053

updated ChangeLog
author Konstantina Bereta <>
date Fri May 10 16:10:00 2013 +0300 (2013-05-10)
parents ef429743d55a
children da14a303bf2c
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1 Day Month Date Hour:Min:Sec Year Pyravlos Team
3 * Version 3.2.9 released.
5 * Added support of all SPARQL result types provided by Sesame (json,
6 xml, csv, tsv, binary). To get the respective writer, just prepend the
7 string "SPARQL/", e.g., "SPARQL/JSON". This is to ensure that we
8 support all SPARQL result formats of the SPARQL Protocol.
10 * Fixed a bug where a non-implemented extension function would make
11 Strabon throw a NULL pointer exception. Now we get away with it
12 through a warning.
14 * Strabon endpoint now publishes the URIs of the supported units of
15 measure for use in strdf:distance and geof:distance functions of
16 stSPARQL and GeoSPARQL, respectively. The URIs are those defined by
17 OGC Units of Measure 1.0 specification which may be found at
18 Strabon endpoint publishes
19 the URIs at http://localhost:8080/endpoint/Capabilities.
21 * Created new module with name 'vocab` and artifactId
22 'strabon-vocabulary` and moved there. Other
23 vocabularies have been added as well, such as Simple Features, and
26 * Strabon endpoint now publishes the URIs of the supported extension
27 functions for stSPARQL and GeoSPARQL. One should access them by
28 hitting the link http://localhost:8080/endpoint/Capabilities.
30 * Support for parsing EPSG URIs in geometry literals with datatype
31 geo:wktLiteral.
32 (bug #33:
34 *Modified the NQUADSTranslator so that the rewritten triples are
35 immediately flushed to the database once they are created.
37 *In the N-Quads format, the fourth element is *optional*. Made proper
38 modification to the storage manager to coply to the specification
39 described here: Now files in
40 NQUADS format can contain quads *or* triples in order to be stored
41 successfully in Strabon.
43 *Fixed bug that occurs when storing periods having "UC" as ending
44 point.
46 *Added an initial set of tests on temporal operations in the
47 testsuite module.
49 *Completed support for temporal updates
51 *Moved vocabulary related to the temporal features of Strabon to the
52 respective "vocabulary" project
54 *The evaluation of temporal joins in the database does not produce
55 cartesian products in the database
57 Tue Mar 26 13:28:26 2013 Pyravlos Team
59 * Version 3.2.8 released.
61 * Added support for handling (storing/querying) GeoSPARQL datatypes.
62 (bug #31:
64 * Fixed a bug in StoreOp that wouldn't close the connection, neither
65 rollback the transaction upon an exception. This had as a side effect
66 the abnormal termination of StoreOp (through for example the use of
67 Ctrl-C signal) which was leaving the database locked.
69 * Fixed bug where spatial aggregates (e.g., union) didn't work as
70 expected when the query didn't contain a `GROUP BY' clause.
71 (bug #22:
73 * Updated GeoSPARQL namespaces and fixed function names to comply with
74 the GeoSPARQL specification.
75 (bug #25:
77 *Added preliminary tests on temporal functions in the respective
78 "test" package of the runtime module.
80 *Added option to strabon and endpoint scripts to support storing
81 files in NQUADS format.
83 *When a large file in NQUADS format is going to be stored, it is
84 partitioned and stored in parts. This happens because the translation
85 of quads to triples is a memory intensive job, so, translating and
86 storing the file in batches increases performance.
89 Wed Jan 09 18:06:41 2013 Pyravlos Team
91 * Version 3.2.7 released.
93 * Add an extension function
94 <> for computing the
95 span (in milliseconds) between two timestamps.
97 * Added an <endpoint-exec> module. This module builds an executable jar file
98 with an embedded Apache Tomcat 7. To create and run the executable jar just
99 type:
100 $ mvn clean package
101 $ java -jar endpoint-exec/target/strabon-endpoint-executable-*.jar
103 * Modified strabon script and postgis/monetdb.StoreOP class to get an
104 option for storing a RDF file in a named graph. Moreover, the RDF
105 format of the input RDF file now is given as an option (still, if it
106 is missing, it is assumed that the input is in N-TRIPLES format). The
107 option for the format is -f and the option for the named graph is -g
108 (takes a URI as an argument).
110 * Modified the names of the stSPARQL extension functions that
111 utilize the minimum bounding boxes of the involved geometries.
113 *Fixed bug in the evaluation of temporal constructs.
115 *Fixed a major bug that occured when a temporal variable that also took part
116 in a temporal join was projected.
118 *Renamed temporal extension functions to comply with the respective
119 functions of Allen's temporal relations.
121 *Modified the implementation of the temporal relation functions
122 "meets", "starts", "finishes", to comply with the semantics of the
123 respective functions of Allen. These functions are not supported by
124 PostgreSQL Temporal, so, in order to be evaluated in the database
125 level, we implemented them as PostgreSQL extension functions.
126 ATTENTION: In order to use these functions, the respective sql script
127 that includes them should be loaded to the the temporally (and spa-
128 tially) enabled database.
131 Tue Dec 11 19:33:45 2012 Pyravlos Team
133 * Version 3.2.6 released.
135 * Modified the names of the stSPARQL extension functions to comply
136 with the OGC Simple Features Access standard.
138 Tue Dec 11 00:11:43 2012 Pyravlos Team
140 * Version 3.2.5 released.
142 * Added support for storing and querying temporal information.
143 This functionality may be found in the `temporals' branch.
145 *The datatypes <> and
146 <> are used to
147 represent periods and instants respectively.
149 *The valid time time of triples is represented using quadtruples,
150 with the valid time annotation(instant or period) being the
151 fourth element of the quad. Into this direction:
152 *Strabon has been extended to support the NQUADS format. The
153 respective Sesame packages (of version 2.6.9) that support
154 this format are used.
156 *NQuadTranslator class has been created. This class uses the
157 NQUADS parser which is available here:
158 The initial version of this parser did not include support
159 for literals as the fourth element of the quad. We exteded
160 it to support the valid time representations described above.
162 *The NQUADSTranslator translates quads into triples using the
163 named graph approach, similar to the one proposed by Tappolet
164 et al. and described in
166 *The rdbms level of Strabon has been extended to (i) support
167 tha period datatype (ii) store the period values in the table
168 period_values(id, period). The period column is of the period
169 datatype, offered by the PostgreSQL Temporal extension (
170 Also, a GiST index is created on this column.
172 *A rewriting mechanism that converts quad graph patterns into
173 triple partners using the named graphs approach has been
174 implemented as a method of the runtime.generaldb.Strabon
175 class.
177 *A big part of the temporal functions of stSPARQL has been
178 imlemented. These functions include:
179 *The temporal relation functions during, periodOverlaps,
180 equalsPeriod, nequalsPeriod, adjacent, before, after,
181 overleft, overright, meets, starts, finishes.
183 *The period constructors period_intersect, period_union,
184 preceding_period, and succeeding_period. The last two
185 constructors are implemented using the jtemporal library.
186 The other functions are implemented in the database,
187 being mapped into the respective functions of PostgreSQL
188 Temporal. A complete reference of PostgreSQL Temporal
189 can be found here:
191 *The temporal constants "NOW" and "UC" (Until Changed)
192 are supported.
194 *The vocabulary of the valid time dimension of stSPARQL can
195 be found at the TemporalConstants class of the evaluation
196 module.
198 * Changed behaviour of Strabon and Strabon Endpoint for connecting to
199 a spatially-enabled database. Only one instance of Strabon is allowed
200 at a time.
202 * Implemented a Java client for Strabon Endpoint. The client should be
203 used only with endpoint versions >=3.2.5. The implementation may be
204 found int the `endpoint-client' submodule of maven. Currently, only
205 querying of Strabon Endpoints is supported.
207 * Added support for requesting the capabilities of Strabon Endpoint
208 (fixes Bug #20 <>). See
209 changesets f840796400bf and ?<TBC>? for specific details and how you
210 can determine the capabilities of older endpoints (versions <= 3.2.4).
212 * Updated KML writer to include the projected variables of an stSPARQL
213 query in "ExtendedData" and "Data" tags. This is the proper way to
214 do it if we need to convert a KML to a ESRI shapefile and also include
215 such information as attributes for a feature. See related pages from
216 KML specification:
217 <>
218 <>
220 * Added user authentication for storing RDF data through Strabon
221 Endpoint. The credentials are specified in
222 WEB-INF/ file.
224 * Strabon Endpoints now limits the number of the results to a maximum
225 one. The maximum number is specified in the beans.xml file. This
226 corresponds to parameter "maxLimit". The endpoint script has also been
227 updated correspondingly; the limit can be given using the option "-l".
228 One can disable limiting of query results, by setting the "maxLimit"
229 parameter to 0. Addresses Bug #6
230 (<>).
232 * Added "Known Issues" section to README.
234 * Added -m (more memory) and -M (much more memory) options in strabon
235 script for out-of-memory exceptions.
237 * Fixed Bug #10 (<>). Now
238 KMLWriter handles more geometric types (other than polygons). See
239 changeset 9a3bfee64a39.
241 * Menu and navigation in Strabon Endpoint has changed to use jquery.
242 The menu is now populated using the queries placed inside the beans.xml.
244 * Added BrowseBean and browse.jsp for browsing the RDF data using the
245 Strabon Endpoint.