view ChangeLog @ 1142:b739b7f99c4d

updated Changelog
author Konstantina Bereta <>
date Wed May 01 14:05:20 2013 +0300 (2013-05-01)
parents 4e4583f93e69
children ef429743d55a
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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 Tue Mar 26 13:28:26 2013 Pyravlos Team
51 * Version 3.2.8 released.
53 * Added support for handling (storing/querying) GeoSPARQL datatypes.
54 (bug #31:
56 * Fixed a bug in StoreOp that wouldn't close the connection, neither
57 rollback the transaction upon an exception. This had as a side effect
58 the abnormal termination of StoreOp (through for example the use of
59 Ctrl-C signal) which was leaving the database locked.
61 * Fixed bug where spatial aggregates (e.g., union) didn't work as
62 expected when the query didn't contain a `GROUP BY' clause.
63 (bug #22:
65 * Updated GeoSPARQL namespaces and fixed function names to comply with
66 the GeoSPARQL specification.
67 (bug #25:
69 *Added preliminary tests on temporal functions in the respective
70 "test" package of the runtime module.
72 *Added option to strabon and endpoint scripts to support storing
73 files in NQUADS format.
75 *When a large file in NQUADS format is going to be stored, it is
76 partitioned and stored in parts. This happens because the translation
77 of quads to triples is a memory intensive job, so, translating and
78 storing the file in batches increases performance.
81 Wed Jan 09 18:06:41 2013 Pyravlos Team
83 * Version 3.2.7 released.
85 * Add an extension function
86 <> for computing the
87 span (in milliseconds) between two timestamps.
89 * Added an <endpoint-exec> module. This module builds an executable jar file
90 with an embedded Apache Tomcat 7. To create and run the executable jar just
91 type:
92 $ mvn clean package
93 $ java -jar endpoint-exec/target/strabon-endpoint-executable-*.jar
95 * Modified strabon script and postgis/monetdb.StoreOP class to get an
96 option for storing a RDF file in a named graph. Moreover, the RDF
97 format of the input RDF file now is given as an option (still, if it
98 is missing, it is assumed that the input is in N-TRIPLES format). The
99 option for the format is -f and the option for the named graph is -g
100 (takes a URI as an argument).
102 * Modified the names of the stSPARQL extension functions that
103 utilize the minimum bounding boxes of the involved geometries.
105 *Fixed bug in the evaluation of temporal constructs.
107 *Fixed a major bug that occured when a temporal variable that also took part
108 in a temporal join was projected.
110 *Renamed temporal extension functions to comply with the respective
111 functions of Allen's temporal relations.
113 *Modified the implementation of the temporal relation functions
114 "meets", "starts", "finishes", to comply with the semantics of the
115 respective functions of Allen. These functions are not supported by
116 PostgreSQL Temporal, so, in order to be evaluated in the database
117 level, we implemented them as PostgreSQL extension functions.
118 ATTENTION: In order to use these functions, the respective sql script
119 that includes them should be loaded to the the temporally (and spa-
120 tially) enabled database.
123 Tue Dec 11 19:33:45 2012 Pyravlos Team
125 * Version 3.2.6 released.
127 * Modified the names of the stSPARQL extension functions to comply
128 with the OGC Simple Features Access standard.
130 Tue Dec 11 00:11:43 2012 Pyravlos Team
132 * Version 3.2.5 released.
134 * Added support for storing and querying temporal information.
135 This functionality may be found in the `temporals' branch.
137 *The datatypes <> and
138 <> are used to
139 represent periods and instants respectively.
141 *The valid time time of triples is represented using quadtruples,
142 with the valid time annotation(instant or period) being the
143 fourth element of the quad. Into this direction:
144 *Strabon has been extended to support the NQUADS format. The
145 respective Sesame packages (of version 2.6.9) that support
146 this format are used.
148 *NQuadTranslator class has been created. This class uses the
149 NQUADS parser which is available here:
150 The initial version of this parser did not include support
151 for literals as the fourth element of the quad. We exteded
152 it to support the valid time representations described above.
154 *The NQUADSTranslator translates quads into triples using the
155 named graph approach, similar to the one proposed by Tappolet
156 et al. and described in
158 *The rdbms level of Strabon has been extended to (i) support
159 tha period datatype (ii) store the period values in the table
160 period_values(id, period). The period column is of the period
161 datatype, offered by the PostgreSQL Temporal extension (
162 Also, a GiST index is created on this column.
164 *A rewriting mechanism that converts quad graph patterns into
165 triple partners using the named graphs approach has been
166 implemented as a method of the runtime.generaldb.Strabon
167 class.
169 *A big part of the temporal functions of stSPARQL has been
170 imlemented. These functions include:
171 *The temporal relation functions during, periodOverlaps,
172 equalsPeriod, nequalsPeriod, adjacent, before, after,
173 overleft, overright, meets, starts, finishes.
175 *The period constructors period_intersect, period_union,
176 preceding_period, and succeeding_period. The last two
177 constructors are implemented using the jtemporal library.
178 The other functions are implemented in the database,
179 being mapped into the respective functions of PostgreSQL
180 Temporal. A complete reference of PostgreSQL Temporal
181 can be found here:
183 *The temporal constants "NOW" and "UC" (Until Changed)
184 are supported.
186 *The vocabulary of the valid time dimension of stSPARQL can
187 be found at the TemporalConstants class of the evaluation
188 module.
190 * Changed behaviour of Strabon and Strabon Endpoint for connecting to
191 a spatially-enabled database. Only one instance of Strabon is allowed
192 at a time.
194 * Implemented a Java client for Strabon Endpoint. The client should be
195 used only with endpoint versions >=3.2.5. The implementation may be
196 found int the `endpoint-client' submodule of maven. Currently, only
197 querying of Strabon Endpoints is supported.
199 * Added support for requesting the capabilities of Strabon Endpoint
200 (fixes Bug #20 <>). See
201 changesets f840796400bf and ?<TBC>? for specific details and how you
202 can determine the capabilities of older endpoints (versions <= 3.2.4).
204 * Updated KML writer to include the projected variables of an stSPARQL
205 query in "ExtendedData" and "Data" tags. This is the proper way to
206 do it if we need to convert a KML to a ESRI shapefile and also include
207 such information as attributes for a feature. See related pages from
208 KML specification:
209 <>
210 <>
212 * Added user authentication for storing RDF data through Strabon
213 Endpoint. The credentials are specified in
214 WEB-INF/ file.
216 * Strabon Endpoints now limits the number of the results to a maximum
217 one. The maximum number is specified in the beans.xml file. This
218 corresponds to parameter "maxLimit". The endpoint script has also been
219 updated correspondingly; the limit can be given using the option "-l".
220 One can disable limiting of query results, by setting the "maxLimit"
221 parameter to 0. Addresses Bug #6
222 (<>).
224 * Added "Known Issues" section to README.
226 * Added -m (more memory) and -M (much more memory) options in strabon
227 script for out-of-memory exceptions.
229 * Fixed Bug #10 (<>). Now
230 KMLWriter handles more geometric types (other than polygons). See
231 changeset 9a3bfee64a39.
233 * Menu and navigation in Strabon Endpoint has changed to use jquery.
234 The menu is now populated using the queries placed inside the beans.xml.
236 * Added BrowseBean and browse.jsp for browsing the RDF data using the
237 Strabon Endpoint.