|
1
|
OAI Protocol for Metadata Harvesting
|
|
2
|
====================================
|
|
3
|
|
|
4
|
The Open Archives Initiative Protocol for Metadata Harvesting (`OAI-PMH`_) was first
|
|
5
|
developed in the late 1990's as a standard for harvesting metadata from
|
|
6
|
distributed metadata/data repositories. The current version of the OAI-PMH
|
|
7
|
standard is 2.0 as of June 2002, with minor updates in December 2008.
|
|
8
|
|
|
9
|
.. _OAI-PMH: http://www.openarchives.org/pmh/
|
|
10
|
|
|
11
|
The OAI-PMH standard uses the Hypertext Transport Protocol (HTTP) as a
|
|
12
|
transport layer and specifies six query methods (called verbs) that must be
|
|
13
|
supported by an OAI-PMH compliant data provider (also referred to as a
|
|
14
|
repository). These methods are:
|
|
15
|
|
|
16
|
1. ``GetRecord`` - retrieves zero or one complete metadata record from a repository;
|
|
17
|
2. ``Identify`` - retrieves information about a repository;
|
|
18
|
3. ``ListIdentifiers`` - retrieves zero or more metadata record "headers" (not the complete metadata record) from a repository;
|
|
19
|
4. ``ListMetadataFormats`` - retrieves a list of available metadata record formats supported by a repository;
|
|
20
|
5. ``ListRecords`` - retrieves zero or more complete metadata records from a repository; and
|
|
21
|
6. ``ListSets`` - retrieves the set structure from a repository.
|
|
22
|
|
|
23
|
The OAI-PMH compliant data provider must accept requests from both HTTP GET
|
|
24
|
and HTTP POST request methods. Responses from the data provider must be
|
|
25
|
returned as an XML-encoded (version 1.0) stream. Error handling must be
|
|
26
|
supported by the data provider and return the correct error response code
|
|
27
|
back to the harvester. Detailed specifications and examples of all six verbs
|
|
28
|
may be viewed in Section 4 of the `OAI-PMH standards document`_.
|
|
29
|
|
|
30
|
.. _OAI-PMH standards document: http://www.openarchives.org/OAI/openarchivesprotocol.html
|
|
31
|
|
|
32
|
EML and Dublin Core
|
|
33
|
-------------------
|
|
34
|
The OAI-PMH requires that unqualified Dublin Core metadata be supported as a
|
|
35
|
minimum. Although EML generally provides more fine-grained metadata than Dublin
|
|
36
|
Core, the two metadata standards do share many of the same (or similar) content
|
|
37
|
elements. Transformations from EML to Dublin Core performed by Metacat OAI-PMH
|
|
38
|
produce *simple* or *unqualified* Dublin Core, which is associated with the reserved
|
|
39
|
metadataPrefix symbol ``oai_dc`` in the OAI-PMH.
|
|
40
|
|
|
41
|
The following table summarizes the element mappings of the EML to Dublin Core
|
|
42
|
crosswalk performed by Metacat OAI-PMH, including notes specific to each
|
|
43
|
element mapping.
|
|
44
|
|
|
45
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
46
|
| EML Element | DC Element | Notes |
|
|
47
|
+=======================================+=============+=================================================================================================================================================+
|
|
48
|
| Title | title | |
|
|
49
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
50
|
| Creator | creator | Use only the creator's name (givenName and surName elements); could be an organization name |
|
|
51
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
52
|
| keyword | subject | One subject element per keyword element |
|
|
53
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
54
|
| abstract | description | Must extract text formatting tags |
|
|
55
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
56
|
| publisher | publisher | Use only the publisher's name (givenName and surName elements); could be an organization name |
|
|
57
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
58
|
| associatedParty | contributor | Use only the party's name (givenName and surName); could be an organization name |
|
|
59
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
60
|
| pubDate | date | One-to-one mapping |
|
|
61
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
62
|
| dataset, citation, protocol, software | type | Type value is determined by the type of EML document rather than by a specific field value |
|
|
63
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
64
|
| physical | format | Use a mime type as the Format value? For example, if EML has <textFormat> element within <physical>, then use 'text/plain' as the Format value? |
|
|
65
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
66
|
| (1) packageId; | identifier | packageId can be used as the value of one identifier element; |
|
|
67
|
| (2) URL to the EML document | | a second identifier element can hold a URL to the EML document |
|
|
68
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
69
|
| dataSource | source | Use the document URL of the referenced data source? |
|
|
70
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
71
|
| Citation | relation | Use the document URL of the referenced citation? |
|
|
72
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
73
|
| geographicCoverage | coverage | Add separate coverage elements for geographic description and geographic bounding coordinates. |
|
|
74
|
| | | For bounding coordinates, use minimal labeling, for example: |
|
|
75
|
| | | 81.505000 W, 81.495000 W, |
|
|
76
|
| | | 31.170000 N, 31.163000 N |
|
|
77
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
78
|
| taxonomicCoverage | coverage | Use only genus/species binomials; place each binomial in a separate coverage element |
|
|
79
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
80
|
| temporalCoverage | coverage | Include begin date and end date when available. For example: |
|
|
81
|
| | | 1915-01-01 to 2004-12-31 |
|
|
82
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
83
|
| intellectualRights | rights | Must extract text formatting tags |
|
|
84
|
+---------------------------------------+-------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
85
|
|
|
86
|
Metacat OAI-PMH includes a set of XSLT stylesheets used for converting specific
|
|
87
|
versions of EML to their Dublin Core equivalents.
|
|
88
|
|
|
89
|
Metacat OAI-PMH Service Interfaces
|
|
90
|
----------------------------------
|
|
91
|
Metacat includes support for two OAI-PMH service interfaces: a data provider
|
|
92
|
(or repository) service interface and a harvester service interface.
|
|
93
|
|
|
94
|
Data Provider
|
|
95
|
~~~~~~~~~~~~~
|
|
96
|
The Metacat OAI-PMH Data Provider service interface supports all six OAI-PMH
|
|
97
|
methods (GetRecord, Identify, ListIdentifiers, ListMetadataFormats, ListRecords,
|
|
98
|
and ListSets) as defined in the OAI-PMH Version 2 Specification through a
|
|
99
|
standard HTTP URL that accepts both HTTP GET and HTTP POST requests.
|
|
100
|
|
|
101
|
The Metacat OAI-PMH Data Provider service was implemented using the Online
|
|
102
|
Computer Library Center (OCLC) OAICat Open Source Software as the basis for
|
|
103
|
its implementation, with customizations added to facilitate integration with
|
|
104
|
Metacat.
|
|
105
|
|
|
106
|
Users of the Metacat OAI-PMH Data Provider should be aware of the following issues:
|
|
107
|
|
|
108
|
* 'Deleted' Status - OAI-PMH repositories can optionally flag records with
|
|
109
|
a 'deleted' status, indicating that a record in the metadata format
|
|
110
|
specified by the metadataPrefix is no longer available. Since Metacat does
|
|
111
|
not provide a mechanism for retrieving a list of deleted documents, the use
|
|
112
|
of the 'deleted' status is not supported in this implementation of the
|
|
113
|
OAI-PMH Data Provider. This represents a possible future enhancement.
|
|
114
|
* Sets - OAI-PMH repositories can optionally support set hierarchies. Since it
|
|
115
|
has not been determined how set hierarchies should be structured in
|
|
116
|
Metacat, this implementation of the OAI-PMH repository does not support
|
|
117
|
set hierarchies. This represents a possible future enhancement.
|
|
118
|
* Datestamp Granularity - When expressing datestamps for repository documents,
|
|
119
|
OAI-PMH allows two levels of granularity: day granularity and seconds
|
|
120
|
granularity. Since the Metacat database stores the value of its
|
|
121
|
``xml_documents.date_updated`` field in day granularity, it is the level
|
|
122
|
that is supported by the Metacat OAI-PMH Data Provider.
|
|
123
|
|
|
124
|
Metacat OAI-PMH Harvester
|
|
125
|
~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
126
|
The Metacat OAI-PMH Harvester service interface utilizes OAI-PMH methods to
|
|
127
|
request metadata or related information from an OAI-PMH-compliant data provider
|
|
128
|
using a standard HTTP URL in either an HTTP-GET or HTTP-POST request.
|
|
129
|
|
|
130
|
The Metacat OAI-PMH Harvester client was implemented using OCLC's
|
|
131
|
OAIHarvester2 open source code as its base implementation, with customizations
|
|
132
|
as needed to support integration with Metacat.
|
|
133
|
|
|
134
|
Users of the Metacat OAI-PMH Harvester should be aware of the following issues:
|
|
135
|
|
|
136
|
* Handling of 'Deleted' status - The Metacat OAI-PMH Harvester program does
|
|
137
|
check to see whether a 'deleted' status is flagged for a harvested document,
|
|
138
|
and if it is, the document is correspondingly deleted from the Metacat repository.
|
|
139
|
* Datestamp Granularity - When expressing datestamps for repository documents,
|
|
140
|
OAI-PMH allows two levels of granularity - day granularity and seconds
|
|
141
|
granularity. Since the Metacat database stores the value of its
|
|
142
|
``xml_documents.last_updated`` field in day granularity, it is also the
|
|
143
|
level that is supported by both the Metacat OAI-PMH Data Provider and the
|
|
144
|
Metacat OAI-PMH Harvester. This has implications when Metacat OAI-PMH
|
|
145
|
Harvester (MOH) interacts with data providers such as the Dryad repository,
|
|
146
|
which stores its documents with seconds granularity. For example, consider
|
|
147
|
the following sequence of events:
|
|
148
|
|
|
149
|
1. On January 1, 2010, MOH harvests a document from the Dryad repository
|
|
150
|
with datestamp '2010-01-01T10:00:00Z', and stores its local copy with
|
|
151
|
datestamp '2010-01-01'.
|
|
152
|
2. Later that same day, the Dryad repository updates the document to a
|
|
153
|
newer revision, with a new datestamp such as '2010-01-01T20:00:0Z'.
|
|
154
|
3. On the following day, MOH runs another harvest. It determines that it
|
|
155
|
has a local copy of the document with datestamp '2010-01-01' and does
|
|
156
|
not re-harvest the document, despite the fact that its local copy is not
|
|
157
|
the latest revision.
|
|
158
|
|
|
159
|
Configuring and Running Metacat OAI-PMH
|
|
160
|
---------------------------------------
|
|
161
|
|
|
162
|
Metacat OAI-PMH Data Provider Servlet
|
|
163
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
164
|
To configure and enable the Data Provider servlet:
|
|
165
|
|
|
166
|
1. Stop Tomcat and edit the Metacat properties (``metacat.properties``) file in
|
|
167
|
the Metacat context directory inside the Tomcat application directory.
|
|
168
|
The Metacat context directory is the name of the application (usually ``knb``):
|
|
169
|
|
|
170
|
::
|
|
171
|
|
|
172
|
<tomcat_app_dir>/<context_dir>/WEB-INF/metacat.properties
|
|
173
|
|
|
174
|
2. Change the following properties appropriately:
|
|
175
|
|
|
176
|
::
|
|
177
|
|
|
178
|
``oaipmh.repositoryIdentifier`` - A string that identifies this repository
|
|
179
|
``Identify.adminEmail`` - The email address of the repository administrator
|
|
180
|
|
|
181
|
3. Edit the deployment descriptor (``web.xml``) file, also in the WEB-INF
|
|
182
|
directory. Uncomment the servlet-name and servlet-mapping entries for the
|
|
183
|
DataProvider servlet by removing the surroundin "<!--" and "-->" strings:
|
|
184
|
|
|
185
|
::
|
|
186
|
|
|
187
|
<servlet>
|
|
188
|
<servlet-name>DataProvider</servlet-name>
|
|
189
|
<description>Processes OAI verbs for Metacat OAI-PMH Data Provider (MODP)</description>
|
|
190
|
<servlet-class>edu.ucsb.nceas.metacat.oaipmh.provider.server.OAIHandler</servlet-class>
|
|
191
|
<load-on-startup>4</load-on-startup>
|
|
192
|
</servlet>
|
|
193
|
<servlet-mapping>
|
|
194
|
<servlet-name>DataProvider</servlet-name>
|
|
195
|
<url-pattern>/dataProvider</url-pattern>
|
|
196
|
</servlet-mapping>
|
|
197
|
|
|
198
|
4. Save the ``metacat.properties`` and ``web.xml`` files and start Tomcat.
|
|
199
|
|
|
200
|
The following table describes the complete set of ``metacat.properties``
|
|
201
|
settings that are used by the DataProvider servlet.
|
|
202
|
|
|
203
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
204
|
| Property Name | Sample Value | Description |
|
|
205
|
+========================================+============================================================================+=================================================================================================================================================+
|
|
206
|
| oaipmh.maxListSize | 5 | Maximum number of records returned by each call to the ListIdentifiers and ListRecords verbs. |
|
|
207
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
208
|
| oaipmh.repositoryIdentifier | metacat.lternet.edu | An identifier string for the respository. |
|
|
209
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
210
|
| AbstractCatalog.oaiCatalogClassName | edu.ucsb.nceas.metacat.oaipmh.provider.server.catalog.MetacatCatalog | The Java class that implements the AbstractCatalog interface. This class determines which records exist in the repository and their datestamps. |
|
|
211
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
212
|
| AbstractCatalog.recordFactoryClassName | edu.ucsb.nceas.metacat.oaipmh.provider.server.catalog.MetacatRecordFactory | The Java class that extends the RecordFactory class. This class creates OAI-PMH metadata records. |
|
|
213
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
214
|
| AbstractCatalog.secondsToLive | 3600 | The lifetime, in seconds, of the resumptionToken. |
|
|
215
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
216
|
| AbstractCatalog.granularity | YYYY-MM-DD or | Granularity of datestamps. Either "days granularity" or "seconds granularity" values can be used. |
|
|
217
|
| | YYYY-MM-DDThh:mm:ssZ | |
|
|
218
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
219
|
| Identify.repositoryName | Metacat OAI-PMH Data Provider | A name for the repository. |
|
|
220
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
221
|
| Identify.earliestDatestamp | 2000-01-01T00:00:00Z | Earliest datestamp supported by this repository |
|
|
222
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
223
|
| Identify.deletedRecord | yes or no | Use "yes" if the repository indicates the status of deleted records; use "no" if it doesn't. |
|
|
224
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
225
|
| Identify.adminEmail | mailto:tech_support@someplace.org | Email address of the repository administrator. |
|
|
226
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
227
|
| Crosswalks.oai_dc | edu.ucsb.nceas.metacat.oaipmh.provider.server.crosswalk.Eml2oai_dc | Java class that controls the EML 2.x.y to oai_dc (Dublin Core) crosswalk. |
|
|
228
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
229
|
| Crosswalks.eml2.0.0 | edu.ucsb.nceas.metacat.oaipmh.provider.server.crosswalk.Eml200 | Java class that furnishes EML 2.0.0 metadata. |
|
|
230
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
231
|
| Crosswalks.eml2.0.1 | edu.ucsb.nceas.metacat.oaipmh.provider.server.crosswalk.Eml201 | Java class that furnishes EML 2.0.1 metadata. |
|
|
232
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
233
|
| Crosswalks.eml2.1.0 | edu.ucsb.nceas.metacat.oaipmh.provider.server.crosswalk.Eml210 | Java class that furnishes EML 2.1.0 metadata. |
|
|
234
|
+----------------------------------------+----------------------------------------------------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------+
|
|
235
|
|
|
236
|
|
|
237
|
Sample URLs
|
|
238
|
...........
|
|
239
|
Sample URLs that demonstrate use of the Metacat OAI-PMH Data Provider follow:
|
|
240
|
|
|
241
|
+---------------------+--------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+
|
|
242
|
| OAI-PMH Verb | Description | URL |
|
|
243
|
+=====================+==============================================================+==========================================================================================================================================+
|
|
244
|
| GetRecord | Get an EML 2.0.1 record using its LSID identifier | http://<your_context_url>/dataProvider?verb=GetRecord&metadataPrefix=eml-2.0.1&identifier=urn:lsid:knb.ecoinformatics.org:knb-ltergce:26 |
|
|
245
|
+---------------------+--------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+
|
|
246
|
| GetRecord | Get an oai_dc (Dublin Core) record using its LSID identifier | http://<your_context_url>/dataProvider?verb=GetRecord&metadataPrefix=oai_dc&identifier=urn:lsid:knb.ecoinformatics.org:knb-lter-gce:26 |
|
|
247
|
+---------------------+--------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+
|
|
248
|
| Identify | Identify this data provider | http://<your_context_url>/dataProvider?verb=Identify |
|
|
249
|
+---------------------+--------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+
|
|
250
|
| ListIdentifiers | List all EML 2.1.0 identifiers in the repository | http://<your_context_url>/dataProvider?verb=ListIdentifiers&metadataPrefix=eml-2.1.0 |
|
|
251
|
+---------------------+--------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+
|
|
252
|
| ListIdentifiers | List all oai_dc (Dublin Core) identifiers in the | http://<your_context_url>/dataProvider?verb=ListIdentifiers&metadataPrefix=oai_dc&from=2006-01-01&until=2010-01-01 |
|
|
253
|
| | repository between a range of dates | |
|
|
254
|
+---------------------+--------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+
|
|
255
|
| ListMetadataFormats | List metadata formats supported by this repository | http://<your_context_url>/dataProvider?verb=ListMetadataFormats |
|
|
256
|
+---------------------+--------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+
|
|
257
|
| ListRecords | List all EML 2.0.0 records in the repository | http://<your_context_url>/dataProvider?verb=ListRecords&metadataPrefix=eml-2.0.0 |
|
|
258
|
+---------------------+--------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+
|
|
259
|
| ListRecords | List all oai_dc (Dublin Core) records in the repository | http://<your_context_url>/dataProvider?verb=ListRecords&metadataPrefix=oai_dc |
|
|
260
|
+---------------------+--------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+
|
|
261
|
| ListSets | List sets supported by this repository | http://<your_context_url>/dataProvider?verb=ListSets |
|
|
262
|
+---------------------+--------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+
|
|
263
|
|
|
264
|
|
|
265
|
Metacat OAI-PMH Harvester
|
|
266
|
~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
267
|
The Metacat OAI-PMH Harvester (MOH) is executed as a command-line program::
|
|
268
|
|
|
269
|
sh runHarvester.sh -dn <distinguishedName> \
|
|
270
|
-password <password> \
|
|
271
|
-metadataPrefix <prefix> \
|
|
272
|
[-from <fromDate>] \
|
|
273
|
[-until <untilDate>] \
|
|
274
|
[-setSpec <setName>] \
|
|
275
|
<baseURL>
|
|
276
|
|
|
277
|
The following example illustrates how the Metacat OAI-PMH Harvester is run from the command line:
|
|
278
|
|
|
279
|
1. Open a system command window or terminal window.
|
|
280
|
2. Set the METACAT_HOME environment variable to the value of the Metacat
|
|
281
|
installation directory. Some examples follow:
|
|
282
|
|
|
283
|
On Windows:
|
|
284
|
|
|
285
|
::
|
|
286
|
|
|
287
|
set METACAT_HOME=C:\somePath\metacat
|
|
288
|
|
|
289
|
On Linux/Unix (bash shell):
|
|
290
|
|
|
291
|
::
|
|
292
|
|
|
293
|
export METACAT_HOME=/home/somePath/metacat
|
|
294
|
|
|
295
|
3. cd to the following directory:
|
|
296
|
|
|
297
|
On Windows:
|
|
298
|
|
|
299
|
::
|
|
300
|
|
|
301
|
cd %METACAT_HOME%\lib\oaipmh
|
|
302
|
|
|
303
|
On Linux/Unix:
|
|
304
|
|
|
305
|
::
|
|
306
|
|
|
307
|
cd $METACAT_HOME/lib/oaipmh
|
|
308
|
|
|
309
|
4. Run the appropriate Metacat OAI-PMH Harvester shell script, as determined by the operating system:
|
|
310
|
|
|
311
|
On Windows:
|
|
312
|
|
|
313
|
::
|
|
314
|
|
|
315
|
runHarvester.bat \
|
|
316
|
-dn uid=jdoe,o=myorg,dc=ecoinformatics,dc=org \
|
|
317
|
-password some_password \
|
|
318
|
-metadataPrefix oai_dc \
|
|
319
|
http://baseurl.repository.org/metacat/dataProvider
|
|
320
|
|
|
321
|
On Linux/Unix:
|
|
322
|
|
|
323
|
::
|
|
324
|
|
|
325
|
sh runHarvester.sh \
|
|
326
|
-dn uid=jdoe,o=myorg,dc=ecoinformatics,dc=org \
|
|
327
|
-password some_password \
|
|
328
|
-metadataPrefix oai_dc \
|
|
329
|
http://baseurl.repository.org/metacat/dataProvider
|
|
330
|
|
|
331
|
|
|
332
|
Command line options and parameters are described in the following table:
|
|
333
|
|
|
334
|
+-----------------------------+--------------------------------------------------------+-----------------------------------------------------------------------------------------------------+
|
|
335
|
| Command Option or Parameter | Example | Description |
|
|
336
|
+=============================+========================================================+=====================================================================================================+
|
|
337
|
| -dn | ``-dn uid=dryad,o=LTER,dc=ecoinformatics,dc=org`` | Full distinguished name of the LDAP account used when harvesting documents into Metacat. (Required) |
|
|
338
|
+-----------------------------+--------------------------------------------------------+-----------------------------------------------------------------------------------------------------+
|
|
339
|
| -password | ``-password some_password`` | Password of the LDAP account used when harvesting documents into Metacat. (Required) |
|
|
340
|
+-----------------------------+--------------------------------------------------------+-----------------------------------------------------------------------------------------------------+
|
|
341
|
| -metadataPrefix | ``-metadataPrefix oai_dc`` | The type of documents being harvested from the remote repository. (Required) |
|
|
342
|
+-----------------------------+--------------------------------------------------------+-----------------------------------------------------------------------------------------------------+
|
|
343
|
| -from | ``-from 2000-01-01`` | The lower limit of the datestamp for harvested documents. (Optional) |
|
|
344
|
+-----------------------------+--------------------------------------------------------+-----------------------------------------------------------------------------------------------------+
|
|
345
|
| -until | ``-until 2010-12-31`` | The upper limit of the datestamp for harvested documents. (Optional) |
|
|
346
|
+-----------------------------+--------------------------------------------------------+-----------------------------------------------------------------------------------------------------+
|
|
347
|
| -setSpec | ``-setSpec someSet`` | Harvest documents belonging to this set. (Optional) |
|
|
348
|
+-----------------------------+--------------------------------------------------------+-----------------------------------------------------------------------------------------------------+
|
|
349
|
| base_url | ``http://baseurl.repository.org/metacat/dataProvider`` | Base URL of the remote repository |
|
|
350
|
+-----------------------------+--------------------------------------------------------+-----------------------------------------------------------------------------------------------------+
|
|
351
|
|
|
352
|
|
|
353
|
OAI-PMH Error Codes
|
|
354
|
-------------------
|
|
355
|
|
|
356
|
+-------------------------+--------------------------------------------------------------------------------+---------------------+
|
|
357
|
| Error Code | Description | Applicable Verbs |
|
|
358
|
+-------------------------+--------------------------------------------------------------------------------+---------------------+
|
|
359
|
| badArgument | The request includes illegal arguments, is missing required arguments, | all verbs |
|
|
360
|
| | includes a repeated argument, or values for arguments have an illegal syntax. | |
|
|
361
|
+-------------------------+--------------------------------------------------------------------------------+---------------------+
|
|
362
|
| badResumptionToken | The value of the resumptionToken argument is invalid or expired. | ListIdentifiers |
|
|
363
|
| | | ListRecords |
|
|
364
|
| | | ListSets |
|
|
365
|
+-------------------------+--------------------------------------------------------------------------------+---------------------+
|
|
366
|
| badVerb | Value of the verb argument is not a legal OAI-PMH verb, the verb argument is | N/A |
|
|
367
|
| | missing, or the verb argument is repeated. | |
|
|
368
|
+-------------------------+--------------------------------------------------------------------------------+---------------------+
|
|
369
|
| cannotDisseminateFormat | The metadata format identified by the value given for the metadataPrefix | GetRecord |
|
|
370
|
| | argument is not supported by the item or by the repository. | ListIdentifiers |
|
|
371
|
| | | ListRecords |
|
|
372
|
+-------------------------+--------------------------------------------------------------------------------+---------------------+
|
|
373
|
| idDoesNotExist | The value of the identifier argument is unknown or illegal in this repository. | GetRecord |
|
|
374
|
| | | ListMetadataFormats |
|
|
375
|
+-------------------------+--------------------------------------------------------------------------------+---------------------+
|
|
376
|
| noRecordsMatch | The combination of the values of the from, until, set and metadataPrefix | ListIdentifiers |
|
|
377
|
| | arguments results in an empty list. | ListRecords |
|
|
378
|
+-------------------------+--------------------------------------------------------------------------------+---------------------+
|
|
379
|
| noMetadataFormats | There are no metadata formats available for the specified item. | ListMetadataFormats |
|
|
380
|
+-------------------------+--------------------------------------------------------------------------------+---------------------+
|
|
381
|
| noSetHierarchy | The repository does not support sets. | ListSets |
|
|
382
|
| | | ListIdentifiers |
|
|
383
|
| | | ListRecords |
|
|
384
|
+-------------------------+--------------------------------------------------------------------------------+---------------------+
|
|
385
|
|
|
386
|
|