Day Month Date Hour:Min:Sec Year Pyravlos Team * Version 3.2.9 released. * Added support for the following google chart types: PieChart, AreaChart and ColumnChart to strabon endpoint. * Added extension function which is mapped to the ST_Centroid(geometry) extension function of PostGIS. See also: . * Added extension function which is mapped to the ST_MakeLine(geometry, geometry) extension function of PostGIS. See also: . * Added PostGIS vocabulary class. * Added support of all SPARQL result types provided by Sesame (json, xml, csv, tsv, binary). To get the respective writer, just prepend the string "SPARQL/", e.g., "SPARQL/JSON". This is to ensure that we support all SPARQL result formats of the SPARQL Protocol. * Fixed a bug where a non-implemented extension function would make Strabon throw a NULL pointer exception. Now we get away with it through a warning. * Strabon endpoint now publishes the URIs of the supported units of measure for use in strdf:distance and geof:distance functions of stSPARQL and GeoSPARQL, respectively. The URIs are those defined by OGC Units of Measure 1.0 specification which may be found at http://www.opengis.net/def/uom/OGC/1.0/. Strabon endpoint publishes the URIs at http://localhost:8080/endpoint/Capabilities. * Created new module with name 'vocab` and artifactId 'strabon-vocabulary` and moved GeoConstants.java there. Other vocabularies have been added as well, such as Simple Features, and GeoSPARQL. * Strabon endpoint now publishes the URIs of the supported extension functions for stSPARQL and GeoSPARQL. One should access them by hitting the link http://localhost:8080/endpoint/Capabilities. * Support for parsing EPSG URIs in geometry literals with datatype geo:wktLiteral. (bug #33: http://bug.strabon.di.uoa.gr/ticket/33) *Modified the NQUADSTranslator so that the rewritten triples are immediately flushed to the database once they are created. *In the N-Quads format, the fourth element is *optional*. Made proper modification to the storage manager to coply to the specification described here: http://sw.deri.org/2008/07/n-quads/. Now files in NQUADS format can contain quads *or* triples in order to be stored successfully in Strabon. *Fixed bug that occurs when storing periods having "UC" as ending point. *Added an initial set of tests on temporal operations in the testsuite module. *Completed support for temporal updates *Moved vocabulary related to the temporal features of Strabon to the respective "vocabulary" project *The evaluation of temporal joins in the database does not produce cartesian products in the database * GeoSPARQL functions sfCrosses, sfOverlaps, ehOverlaps do not use the ST_Relate PostGIS function (bug #24: http://bug.strabon.di.uoa.gr/ticket/24) * All Simple Features functions of GeoSPARQL do not use the ST_Relate PostGIS function * Added diffTime function. This function performs the difference between two literals of xsd:time datatype and returns a literal of the xsd:time datatype as well. * Added a testsuite package in default branch. Full tester guide can be found in README. Among other, most of GeoSPARQL compliance tests (https://portal.opengeospatial.org/files/?artifact_id=47664, pg. 53) have been implemented. Tue Mar 26 13:28:26 2013 Pyravlos Team * Version 3.2.8 released. * Added support for handling (storing/querying) GeoSPARQL datatypes. (bug #31: http://bug.strabon.di.uoa.gr/ticket/31) * Fixed a bug in StoreOp that wouldn't close the connection, neither rollback the transaction upon an exception. This had as a side effect the abnormal termination of StoreOp (through for example the use of Ctrl-C signal) which was leaving the database locked. * Fixed bug where spatial aggregates (e.g., union) didn't work as expected when the query didn't contain a `GROUP BY' clause. (bug #22: http://bug.strabon.di.uoa.gr/ticket/22) * Updated GeoSPARQL namespaces and fixed function names to comply with the GeoSPARQL specification. (bug #25: http://bug.strabon.di.uoa.gr/ticket/25) *Added preliminary tests on temporal functions in the respective "test" package of the runtime module. *Added option to strabon and endpoint scripts to support storing files in NQUADS format. *When a large file in NQUADS format is going to be stored, it is partitioned and stored in parts. This happens because the translation of quads to triples is a memory intensive job, so, translating and storing the file in batches increases performance. Wed Jan 09 18:06:41 2013 Pyravlos Team * Version 3.2.7 released. * Add an extension function for computing the span (in milliseconds) between two timestamps. * Added an module. This module builds an executable jar file with an embedded Apache Tomcat 7. To create and run the executable jar just type: $ mvn clean package $ java -jar endpoint-exec/target/strabon-endpoint-executable-*.jar * Modified strabon script and postgis/monetdb.StoreOP class to get an option for storing a RDF file in a named graph. Moreover, the RDF format of the input RDF file now is given as an option (still, if it is missing, it is assumed that the input is in N-TRIPLES format). The option for the format is -f and the option for the named graph is -g (takes a URI as an argument). * Modified the names of the stSPARQL extension functions that utilize the minimum bounding boxes of the involved geometries. *Fixed bug in the evaluation of temporal constructs. *Fixed a major bug that occured when a temporal variable that also took part in a temporal join was projected. *Renamed temporal extension functions to comply with the respective functions of Allen's temporal relations. *Modified the implementation of the temporal relation functions "meets", "starts", "finishes", to comply with the semantics of the respective functions of Allen. These functions are not supported by PostgreSQL Temporal, so, in order to be evaluated in the database level, we implemented them as PostgreSQL extension functions. ATTENTION: In order to use these functions, the respective sql script that includes them should be loaded to the the temporally (and spa- tially) enabled database. Tue Dec 11 19:33:45 2012 Pyravlos Team * Version 3.2.6 released. * Modified the names of the stSPARQL extension functions to comply with the OGC Simple Features Access standard. Tue Dec 11 00:11:43 2012 Pyravlos Team * Version 3.2.5 released. * Added support for storing and querying temporal information. This functionality may be found in the `temporals' branch. *The datatypes and are used to represent periods and instants respectively. *The valid time time of triples is represented using quadtruples, with the valid time annotation(instant or period) being the fourth element of the quad. Into this direction: *Strabon has been extended to support the NQUADS format. The respective Sesame packages (of version 2.6.9) that support this format are used. *NQuadTranslator class has been created. This class uses the NQUADS parser which is available here: https://github.com/joshsh/sesametools/tree/develop/nquads. The initial version of this parser did not include support for literals as the fourth element of the quad. We exteded it to support the valid time representations described above. *The NQUADSTranslator translates quads into triples using the named graph approach, similar to the one proposed by Tappolet et al. and described in http://dl.acm.org/citation.cfm?id=1561565. *The rdbms level of Strabon has been extended to (i) support tha period datatype (ii) store the period values in the table period_values(id, period). The period column is of the period datatype, offered by the PostgreSQL Temporal extension (http://sourceforge.net/projects/pgsql-temporal/). Also, a GiST index is created on this column. *A rewriting mechanism that converts quad graph patterns into triple partners using the named graphs approach has been implemented as a method of the runtime.generaldb.Strabon class. *A big part of the temporal functions of stSPARQL has been imlemented. These functions include: *The temporal relation functions during, periodOverlaps, equalsPeriod, nequalsPeriod, adjacent, before, after, overleft, overright, meets, starts, finishes. *The period constructors period_intersect, period_union, preceding_period, and succeeding_period. The last two constructors are implemented using the jtemporal library. The other functions are implemented in the database, being mapped into the respective functions of PostgreSQL Temporal. A complete reference of PostgreSQL Temporal can be found here: http://temporal.projects.pgfoundry.org/reference.html. *The temporal constants "NOW" and "UC" (Until Changed) are supported. *The vocabulary of the valid time dimension of stSPARQL can be found at the TemporalConstants class of the evaluation module. * Changed behaviour of Strabon and Strabon Endpoint for connecting to a spatially-enabled database. Only one instance of Strabon is allowed at a time. * Implemented a Java client for Strabon Endpoint. The client should be used only with endpoint versions >=3.2.5. The implementation may be found int the `endpoint-client' submodule of maven. Currently, only querying of Strabon Endpoints is supported. * Added support for requesting the capabilities of Strabon Endpoint (fixes Bug #20 ). See changesets f840796400bf and ?? for specific details and how you can determine the capabilities of older endpoints (versions <= 3.2.4). * Updated KML writer to include the projected variables of an stSPARQL query in "ExtendedData" and "Data" tags. This is the proper way to do it if we need to convert a KML to a ESRI shapefile and also include such information as attributes for a feature. See related pages from KML specification: * Added user authentication for storing RDF data through Strabon Endpoint. The credentials are specified in WEB-INF/credentials.properties file. * Strabon Endpoints now limits the number of the results to a maximum one. The maximum number is specified in the beans.xml file. This corresponds to parameter "maxLimit". The endpoint script has also been updated correspondingly; the limit can be given using the option "-l". One can disable limiting of query results, by setting the "maxLimit" parameter to 0. Addresses Bug #6 (). * Added "Known Issues" section to README. * Added -m (more memory) and -M (much more memory) options in strabon script for out-of-memory exceptions. * Fixed Bug #10 (). Now KMLWriter handles more geometric types (other than polygons). See changeset 9a3bfee64a39. * Menu and navigation in Strabon Endpoint has changed to use jquery. The menu is now populated using the queries placed inside the beans.xml. * Added BrowseBean and browse.jsp for browsing the RDF data using the Strabon Endpoint.