├── .github
└── workflows
│ └── main.yml
├── .gitignore
├── LICENSE
├── LODCloud_SPARQL_Endpoints.ttl
├── README.md
├── diff-status.sh
├── latest-status.ttl
├── status-check.sparql
├── trash
├── README.md
├── alive-endpoints-2020-03-12.ttl
├── resources
│ ├── sparql-endpoints-from-andre-status.trig
│ ├── sparql-endpoints-from-andre.ttl
│ ├── sparql-endpoints-from-sparqles-api-status.trig
│ └── sparql-endpoints-from-sparqles-api.ttl
├── scripts
│ ├── check-endpoint-status.sparql
│ ├── check-test.sparql
│ ├── extract-alive-endpoints.sparql
│ ├── rdfize-endpoints-from-andre.sparql
│ └── rdfize-endpoints-from-sparqles-api.sparql
└── sparql-service-description.ttl
└── update-status.sh
/.github/workflows/main.yml:
--------------------------------------------------------------------------------
1 | ---
2 | on:
3 | schedule:
4 | - cron: '0 * * * *'
5 |
6 | jobs:
7 | update-sparql-endpoint-status:
8 | runs-on: ubuntu-latest
9 | name: Update SPARQL Endpoint Service Status
10 | steps:
11 | - uses: actions/checkout@v1
12 | - name: Run service check
13 | run: ./update-status.sh
14 | - name: Commit files
15 | run: |
16 | git diff-index --quiet HEAD || git add latest-status.ttl
17 | git config --local user.email "cstadler@informatik.uni-leipzig.de"
18 | git config --local user.name "Claus Stadler"
19 | git diff-index --quiet HEAD || git commit -m "Automatic status update" -a
20 | - name: Push changes
21 | uses: ad-m/github-push-action@master
22 | with:
23 | github_token: ${{ secrets.GITHUB_TOKEN }}
24 |
25 |
26 | # - name: Upload status
27 | # uses: actions/upload-artifact@v1
28 | # with:
29 | # name: status
30 | # path: status.trig
31 |
--------------------------------------------------------------------------------
/.gitignore:
--------------------------------------------------------------------------------
1 | # Compiled class file
2 | *.class
3 |
4 | # Log file
5 | *.log
6 |
7 | # BlueJ files
8 | *.ctxt
9 |
10 | # Mobile Tools for Java (J2ME)
11 | .mtj.tmp/
12 |
13 | # Package Files #
14 | *.jar
15 | *.war
16 | *.nar
17 | *.ear
18 | *.zip
19 | *.tar.gz
20 | *.rar
21 |
22 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
23 | hs_err_pid*
24 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
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/README.md:
--------------------------------------------------------------------------------
1 | # Linked Open Data and SPARQL Endpoints Observatory
2 |
3 | This repo provides automated service monitoring of SPARQL Endpoints on an hourly basis.
4 | The results are published in the file [latest-status.ttl](https://github.com/SmartDataAnalytics/lodservatory/blob/master/latest-status.ttl).
5 | Many Linked Data clients can consume the data directly from
6 |
7 | https://raw.githubusercontent.com/SmartDataAnalytics/lodservatory/master/latest-status.ttl
8 |
9 | ### How Does It Work
10 |
11 | There is [this git action](.github/workflows/main.yml) which invokes the following process every hour.
12 |
13 | The script [update-status.sh](update-status.sh) first downloads [OpenLink's SPARQL endpoint dataset](https://github.com/OpenLinkSoftware/general-turtle-doc-collection/blob/master/LODCloud_SPARQL_Endpoints.ttl) and then runs the SPARQL query in [status-check.sparql](status-check.sparql) on each endpoint URL.
14 |
15 | The workflow runner is our [sparql-integrate command line tool](https://github.com/SmartDataAnalytics/Sparqlintegrate), built on [Apache Jena](https://jena.apache.org/), which simplifies the process of mashing-up RDF datasets and SPARQL queries.
16 |
17 | ### Is Service Monitoring using GitActions Permitted?
18 | According to this answer to my question: [Yes](https://github.com/orgs/community/discussions/26140)
19 |
20 | ### How To Contribute...
21 |
22 | #### ... New Endpoints?
23 | This project uses
24 | [OpenLink's SPARQL endpoint dataset](https://github.com/OpenLinkSoftware/general-turtle-doc-collection/blob/master/LODCloud_SPARQL_Endpoints.ttl) as the source, please make pull requests there.
25 |
26 | #### ... Additional Service Information?
27 | As github has API limits (1000 requests per hour) it may be better to make separate projects for other kind of information, such as void descriptions. Note, that one can use this service status dataset as the basis in order to not waste requests!
28 |
29 | Feel free to contribute your ideas on the issue tracker.
30 |
31 | ### How Can I Monitor My Own Endpoints?
32 |
33 | Just clone the repo and use a different dataset of endpoints as the source.
34 |
35 | ### Licence
36 | The source code of this repo is published under the [Apache License Version 2.0](LICENSE).
37 |
38 |
39 |
--------------------------------------------------------------------------------
/diff-status.sh:
--------------------------------------------------------------------------------
1 | #!/bin/bash
2 |
3 | # Purpose: Prevent update of service status time stamps if the status has not changed
4 |
5 |
6 | CURRENT="$1"
7 | NEXT="$2"
8 |
9 | [ -f "$CURRENT" ] || touch "$CURRENT"
10 |
11 | # Load the old status
12 | # Copy it to a named graph (we should add a short cut for this)
13 | # Laod the current status into the default graph
14 | # Replace new timestamps in the default graph with the old ones from the named graph if the status is still the same
15 | java -cp si.jar sparqlintegrate --w=trig/pretty \
16 | "$CURRENT" \
17 | 'DELETE { ?s ?p ?o } INSERT { GRAPH eg:old { ?s ?p ?o } } WHERE { ?s ?p ?o }' \
18 | "$NEXT" \
19 | 'PREFIX schema: DELETE { ?s schema:dateModified ?newTime } INSERT { ?s schema:dateModified ?oldTime } WHERE { ?s schema:serverStatus ?newStatus ; schema:dateModified ?newTime GRAPH ?g { ?s schema:serverStatus ?oldStatus ; schema:dateModified ?oldTime } FILTER(?oldStatus = ?newStatus) }' \
20 | 'CONSTRUCT WHERE { ?s ?p ?o } ORDER BY ?s ?p ?o'
21 |
22 |
23 |
--------------------------------------------------------------------------------
/latest-status.ttl:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/SmartDataAnalytics/lodservatory/2d0b621e6db16e99418f5bdf5e229ab720eb1a27/latest-status.ttl
--------------------------------------------------------------------------------
/status-check.sparql:
--------------------------------------------------------------------------------
1 | PREFIX eg:
2 | PREFIX sd:
3 | PREFIX schema:
4 |
5 | CONSTRUCT {
6 | GRAPH ?g {
7 | ?s
8 | a sd:Service ;
9 | sd:endpoint ?e ;
10 | schema:serverStatus ?status ;
11 | schema:dateModified ?time ;
12 | .
13 | }
14 | }
15 | {
16 | BIND(NOW() AS ?time)
17 |
18 | GRAPH ?g { ?s sd:endpoint ?e }
19 |
20 | OPTIONAL {
21 | SERVICE SILENT ?e {
22 | { SELECT ?t { ?x ?y ?t } LIMIT 1 }
23 | }
24 | }
25 |
26 | # This is a best-effort query; it assumes at least one type triple in the default graph
27 | # It should work for 99% of the cases
28 | # The issue is, that I don't trust lecacy endpoints to handle ?s ?p ?o well
29 | # (especially mysql based ones: first copy everything into a temporary table of everything, than pick the 1 result...)
30 | # And some may even complain about exceeded execution time estimations
31 | BIND(IF(BOUND(?t), schema:Online, schema:OfflineTemporarily) AS ?status)
32 | }
33 |
--------------------------------------------------------------------------------
/trash/README.md:
--------------------------------------------------------------------------------
1 | # Linked Open Data and SPARQL Endpoints Observatory
2 |
3 | **Work in progress**
4 |
5 | This repository features community datasets about SPARQL endpoints and datasets using the [DCAT2](https://www.w3.org/TR/vocab-dcat-2/) and [Service Description](https://www.w3.org/TR/sparql11-service-description/) data models as the backbone.
6 |
7 | What the community gets from this
8 |
9 | * A list of service URLS
10 | * Dataset identifiers and their relations to services that host them
11 | * Service Status information (online/offline)
12 | * More information to come
13 |
14 | Although https://sparqles.ai.wu.ac.at/ has a nice user interface and features a non-RDF API, this repo demonstrates, that combining a dataset of sparql endpoints with a sparql query that retrieves the online status with a git action is sufficient to automatically publish time-slice datasets with service status information.
15 |
16 |
17 | ## How does it work
18 | This repo demonstrates our mighty [sparql-integrate](https://github.com/SmartDataAnalytics/SparqlIntegrate) toolkit. It is simply a Java command line tool that combines RDF dataset and RDF stream processing using the commands `sparqlintegrate` and `ngs`. The latter stands for "named graph stream". You can either build sparql-integrate yourself, or download the jar bundle from the [releases section](https://github.com/SmartDataAnalytics/SparqlIntegrate/releases).
19 |
20 |
21 | The whole workflow is just this:
22 | ```bash
23 | # Load the endpoint dataset and map it to a set of named graphs
24 | java -cp si.jar sparqlintegrate \
25 | alive-endpoints-latest.ttl \
26 | playground/endpoint-to-graph.sparql | \
27 | # Map the set of named graphs in PARALLEL! through the status check sparql query
28 | # whereas -t specifies the connection timeout, query timeout
29 | java -cp si.jar ngs \
30 | map -t '5000,5000' --sparql playground/check-test.sparql |\
31 | # Combine the triples of resulting named graphs into a single dataset
32 | # --u is union named graph mode, so ?s ?p ?o runs over all named graphs
33 | java -cp si.jar sparqlintegrate --w=trig/pretty \
34 | --u - 'CONSTRUCT WHERE { ?s ?p ?o }' > latest-status.ttl
35 | ```
36 |
37 | ## Is doing remote requests with GitActions permitted
38 |
39 | According to [this answer](https://github.community/t5/GitHub-Actions/Is-it-permitted-to-do-Remote-Requests-for-Service-Monitoring/m-p/50071#M7696): yes.
40 |
41 |
42 | ## Register your own endpoint
43 | (This is work in progress; it not yet implemented)
44 |
45 |
46 | ### Register a query that fetches data from your API
47 |
48 | Create a query just like [this one](https://github.com/SmartDataAnalytics/lodservatory/blob/master/scripts/rdfize-endpoints-from-sparqles-api.sparql) that extracts the JSON from the sparqles API as RDF.
49 |
50 | ### Register the actual data
51 |
52 | * Create a folder for the endpoint URL in the service directory. Omit the scheme (http(s)), reverse the host name (like Java packages), and create sub directories according to the path part of the URL. For example, `http://dbpedia.org/sparql` would turn into `services/org/dbpedia/sparql`
53 | * Create a description of the service and the dataset it provides. In the simplest case this is just the endpointURL. DCAT distributions capture technical aspects of dataset distributions, and the graph(s) in which is it is hosted is such as aspect.
54 | Note, that if the data hosted in a SPARQL endpoint does not exacly match a given dataset identifier, consider using a fresh dataset identifier such as 'http://your.endpoint/sparql#dataset`.
55 |
56 | ```turtle
57 | #service.ttl
58 |
59 | a cat:DataService ;
60 | cat:endpointURL ;
61 | .
62 |
63 |
64 | # <- Dataset identifier
65 | a cat:Dataset ;
66 | cat:distribution [
67 | a cat:Distribution ;
68 | cat:accessURL ;
69 | catx:graphs () # <- Constrain the distribution to this graph
70 | ]
71 | ```
72 | TODO Decide on catx namespace.
73 |
74 |
75 | ### Link to a remote description
76 | Maybe you have your own git repo, sparql endpoint, or other source of information.
77 | In that case there is no need to duplicate the information, but instead you can link to it.
78 |
79 |
80 | #### Linking with Conjure
81 | [Conjure](https://github.com/SmartDataAnalytics/Conjure/) is a system for referencing and transforming RDF data by means of workflows which can use hybrid ETL and query answering over views.
82 |
83 | The simplest workflow specification is a simple URL reference. Any detected conjure descriptions will be transcluded into the _effective_ `service.ttl` file.
84 | ```
85 | #service.ttl
86 | @prefix rpif: .
87 |
88 | []
89 | a rpif:DataRefUrl ;
90 | rpif:dataRefUrl ;
91 | .
92 | ```
93 |
94 |
95 |
96 |
--------------------------------------------------------------------------------
/trash/alive-endpoints-2020-03-12.ttl:
--------------------------------------------------------------------------------
1 | @prefix rdf: .
2 | @prefix cat: .
3 |
4 |
5 | a cat:DataService ;
6 | cat:endpointURL .
7 |
8 |
9 | a cat:DataService ;
10 | cat:endpointURL .
11 |
12 |
13 | a cat:DataService ;
14 | cat:endpointURL .
15 |
16 |
17 | a cat:DataService ;
18 | cat:endpointURL .
19 |
20 |
21 | a cat:DataService ;
22 | cat:endpointURL .
23 |
24 |
25 | a cat:DataService ;
26 | cat:endpointURL .
27 |
28 |
29 | a cat:DataService ;
30 | cat:endpointURL .
31 |
32 |
33 | a cat:DataService ;
34 | cat:endpointURL .
35 |
36 |
37 | a cat:DataService ;
38 | cat:endpointURL .
39 |
40 |
41 | a cat:DataService ;
42 | cat:endpointURL .
43 |
44 |
45 | a cat:DataService ;
46 | cat:endpointURL .
47 |
48 |
49 | a cat:DataService ;
50 | cat:endpointURL .
51 |
52 |
53 | a cat:DataService ;
54 | cat:endpointURL .
55 |
56 |
57 | a cat:DataService ;
58 | cat:endpointURL .
59 |
60 |
61 | a cat:DataService ;
62 | cat:endpointURL .
63 |
64 |
65 | a cat:DataService ;
66 | cat:endpointURL .
67 |
68 |
69 | a cat:DataService ;
70 | cat:endpointURL .
71 |
72 |
73 | a cat:DataService ;
74 | cat:endpointURL .
75 |
76 |
77 | a cat:DataService ;
78 | cat:endpointURL .
79 |
80 |
81 | a cat:DataService ;
82 | cat:endpointURL .
83 |
84 |
85 | a cat:DataService ;
86 | cat:endpointURL .
87 |
88 |
89 | a cat:DataService ;
90 | cat:endpointURL .
91 |
92 |
93 | a cat:DataService ;
94 | cat:endpointURL .
95 |
96 |
97 | a cat:DataService ;
98 | cat:endpointURL .
99 |
100 |
101 | a cat:DataService ;
102 | cat:endpointURL .
103 |
104 |
105 | a cat:DataService ;
106 | cat:endpointURL .
107 |
108 |
109 | a cat:DataService ;
110 | cat:endpointURL .
111 |
112 |
113 | a cat:DataService ;
114 | cat:endpointURL .
115 |
116 |
117 | a cat:DataService ;
118 | cat:endpointURL .
119 |
120 |
121 | a cat:DataService ;
122 | cat:endpointURL .
123 |
124 |
125 | a cat:DataService ;
126 | cat:endpointURL .
127 |
128 |
129 | a cat:DataService ;
130 | cat:endpointURL .
131 |
132 |
133 | a cat:DataService ;
134 | cat:endpointURL .
135 |
136 |
137 | a cat:DataService ;
138 | cat:endpointURL .
139 |
140 |
141 | a cat:DataService ;
142 | cat:endpointURL .
143 |
144 |
145 | a cat:DataService ;
146 | cat:endpointURL .
147 |
148 |
149 | a cat:DataService ;
150 | cat:endpointURL .
151 |
152 |
153 | a cat:DataService ;
154 | cat:endpointURL .
155 |
156 |
157 | a cat:DataService ;
158 | cat:endpointURL .
159 |
160 |
161 | a cat:DataService ;
162 | cat:endpointURL .
163 |
164 |
165 | a cat:DataService ;
166 | cat:endpointURL .
167 |
168 |
169 | a cat:DataService ;
170 | cat:endpointURL .
171 |
172 |
173 | a cat:DataService ;
174 | cat:endpointURL .
175 |
176 |
177 | a cat:DataService ;
178 | cat:endpointURL .
179 |
180 |
181 | a cat:DataService ;
182 | cat:endpointURL .
183 |
184 |
185 | a cat:DataService ;
186 | cat:endpointURL .
187 |
188 |
189 | a cat:DataService ;
190 | cat:endpointURL .
191 |
192 |
193 | a cat:DataService ;
194 | cat:endpointURL .
195 |
196 |
197 | a cat:DataService ;
198 | cat:endpointURL .
199 |
200 |
201 | a cat:DataService ;
202 | cat:endpointURL .
203 |
204 |
205 | a cat:DataService ;
206 | cat:endpointURL .
207 |
208 |
209 | a cat:DataService ;
210 | cat:endpointURL .
211 |
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213 | a cat:DataService ;
214 | cat:endpointURL .
215 |
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217 | a cat:DataService ;
218 | cat:endpointURL .
219 |
220 |
221 | a cat:DataService ;
222 | cat:endpointURL .
223 |
224 |
225 | a cat:DataService ;
226 | cat:endpointURL .
227 |
228 |
229 | a cat:DataService ;
230 | cat:endpointURL .
231 |
232 |
233 | a cat:DataService ;
234 | cat:endpointURL .
235 |
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237 | a cat:DataService ;
238 | cat:endpointURL .
239 |
240 |
241 | a cat:DataService ;
242 | cat:endpointURL .
243 |
244 |
245 | a cat:DataService ;
246 | cat:endpointURL .
247 |
248 |
249 | a cat:DataService ;
250 | cat:endpointURL .
251 |
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253 | a cat:DataService ;
254 | cat:endpointURL .
255 |
256 |
257 | a cat:DataService ;
258 | cat:endpointURL .
259 |
260 |
261 | a cat:DataService ;
262 | cat:endpointURL .
263 |
264 |
265 | a cat:DataService ;
266 | cat:endpointURL .
267 |
268 |
269 | a cat:DataService ;
270 | cat:endpointURL .
271 |
272 |
273 | a cat:DataService ;
274 | cat:endpointURL .
275 |
276 |
277 | a cat:DataService ;
278 | cat:endpointURL .
279 |
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281 | a cat:DataService ;
282 | cat:endpointURL .
283 |
284 |
285 | a cat:DataService ;
286 | cat:endpointURL .
287 |
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289 | a cat:DataService ;
290 | cat:endpointURL .
291 |
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293 | a cat:DataService ;
294 | cat:endpointURL .
295 |
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297 | a cat:DataService ;
298 | cat:endpointURL .
299 |
300 |
301 | a cat:DataService ;
302 | cat:endpointURL .
303 |
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305 | a cat:DataService ;
306 | cat:endpointURL .
307 |
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309 | a cat:DataService ;
310 | cat:endpointURL .
311 |
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313 | a cat:DataService ;
314 | cat:endpointURL .
315 |
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317 | a cat:DataService ;
318 | cat:endpointURL .
319 |
320 |
321 | a cat:DataService ;
322 | cat:endpointURL .
323 |
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325 | a cat:DataService ;
326 | cat:endpointURL .
327 |
328 |
329 | a cat:DataService ;
330 | cat:endpointURL .
331 |
332 |
333 | a cat:DataService ;
334 | cat:endpointURL .
335 |
336 |
337 | a cat:DataService ;
338 | cat:endpointURL .
339 |
340 |
341 | a cat:DataService ;
342 | cat:endpointURL .
343 |
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345 | a cat:DataService ;
346 | cat:endpointURL .
347 |
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349 | a cat:DataService ;
350 | cat:endpointURL .
351 |
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353 | a cat:DataService ;
354 | cat:endpointURL .
355 |
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357 | a cat:DataService ;
358 | cat:endpointURL .
359 |
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361 | a cat:DataService ;
362 | cat:endpointURL .
363 |
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365 | a cat:DataService ;
366 | cat:endpointURL .
367 |
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369 | a cat:DataService ;
370 | cat:endpointURL .
371 |
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373 | a cat:DataService ;
374 | cat:endpointURL .
375 |
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377 | a cat:DataService ;
378 | cat:endpointURL .
379 |
380 |
381 | a cat:DataService ;
382 | cat:endpointURL .
383 |
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385 | a cat:DataService ;
386 | cat:endpointURL .
387 |
388 |
389 | a cat:DataService ;
390 | cat:endpointURL .
391 |
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393 | a cat:DataService ;
394 | cat:endpointURL .
395 |
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397 | a cat:DataService ;
398 | cat:endpointURL .
399 |
400 |
401 | a cat:DataService ;
402 | cat:endpointURL .
403 |
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405 | a cat:DataService ;
406 | cat:endpointURL .
407 |
408 |
409 | a cat:DataService ;
410 | cat:endpointURL .
411 |
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413 | a cat:DataService ;
414 | cat:endpointURL .
415 |
416 |
417 | a cat:DataService ;
418 | cat:endpointURL .
419 |
420 |
421 | a cat:DataService ;
422 | cat:endpointURL .
423 |
424 |
425 | a cat:DataService ;
426 | cat:endpointURL .
427 |
428 |
429 | a cat:DataService ;
430 | cat:endpointURL .
431 |
432 |
433 | a cat:DataService ;
434 | cat:endpointURL .
435 |
436 |
437 | a cat:DataService ;
438 | cat:endpointURL .
439 |
440 |
441 | a cat:DataService ;
442 | cat:endpointURL .
443 |
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445 | a cat:DataService ;
446 | cat:endpointURL .
447 |
448 |
449 | a cat:DataService ;
450 | cat:endpointURL .
451 |
452 |
453 | a cat:DataService ;
454 | cat:endpointURL .
455 |
456 |
457 | a cat:DataService ;
458 | cat:endpointURL .
459 |
460 |
461 | a cat:DataService ;
462 | cat:endpointURL .
463 |
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465 | a cat:DataService ;
466 | cat:endpointURL .
467 |
468 |
469 | a cat:DataService ;
470 | cat:endpointURL .
471 |
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473 | a cat:DataService ;
474 | cat:endpointURL .
475 |
476 |
477 | a cat:DataService ;
478 | cat:endpointURL .
479 |
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481 | a cat:DataService ;
482 | cat:endpointURL .
483 |
484 |
485 | a cat:DataService ;
486 | cat:endpointURL .
487 |
488 |
489 | a cat:DataService ;
490 | cat:endpointURL .
491 |
492 |
493 | a cat:DataService ;
494 | cat:endpointURL .
495 |
496 |
497 | a cat:DataService ;
498 | cat:endpointURL .
499 |
500 |
501 | a cat:DataService ;
502 | cat:endpointURL .
503 |
504 |
505 | a cat:DataService ;
506 | cat:endpointURL .
507 |
508 |
509 | a cat:DataService ;
510 | cat:endpointURL .
511 |
512 |
513 | a cat:DataService ;
514 | cat:endpointURL .
515 |
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517 | a cat:DataService ;
518 | cat:endpointURL .
519 |
520 |
521 | a cat:DataService ;
522 | cat:endpointURL .
523 |
524 |
525 | a cat:DataService ;
526 | cat:endpointURL .
527 |
528 |
529 | a cat:DataService ;
530 | cat:endpointURL .
531 |
532 |
533 | a cat:DataService ;
534 | cat:endpointURL .
535 |
536 |
537 | a cat:DataService ;
538 | cat:endpointURL .
539 |
540 |
541 | a cat:DataService ;
542 | cat:endpointURL .
543 |
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545 | a cat:DataService ;
546 | cat:endpointURL .
547 |
548 |
549 | a cat:DataService ;
550 | cat:endpointURL .
551 |
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553 | a cat:DataService ;
554 | cat:endpointURL .
555 |
556 |
557 | a cat:DataService ;
558 | cat:endpointURL .
559 |
560 |
561 | a cat:DataService ;
562 | cat:endpointURL .
563 |
564 |
565 | a cat:DataService ;
566 | cat:endpointURL .
567 |
568 |
569 | a cat:DataService ;
570 | cat:endpointURL .
571 |
572 |
573 | a cat:DataService ;
574 | cat:endpointURL .
575 |
576 |
577 | a cat:DataService ;
578 | cat:endpointURL