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11 <title>Pegasus Project Working Paper</title>
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18 <o:TotalTime>3965</o:TotalTime>
19 <o:LastPrinted>2002-03-01T18:47:00Z</o:LastPrinted>
20 <o:Created>2002-02-28T19:29:00Z</o:Created>
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95 <div class=Section1>
96
97 <p class=PaperTitle>Pegasus Project Working Paper</p>
98
99 <p class=PaperTitle>{Title}</p>
100
101 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
102
103 <p class=MsoNormal><b>Authors:</b> {namelist}</p>
104
105 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
106 karl 1.1
107 <p class=MsoNormal><span style='font-size:8.0pt;mso-bidi-font-size:12.0pt'>Last
108 Update <span style='mso-field-code:"SAVEDATE \\* MERGEFORMAT"'>0/0/0000 0:00
109 AM</span><o:p></o:p></span></p>
110
111 <p class=MsoNormal><span style='font-size:8.0pt;mso-bidi-font-size:12.0pt'>Document:
112 <span style='mso-field-code:"FILENAME \\* MERGEFORMAT"'>Document4</span><o:p></o:p></span></p>
113
114 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
115
116 <p class=MsoNormal>Revision Status</p>
117
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185 </tr>
186 </table>
187
188 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
189
190 karl 1.1 <h1>Introduction</h1>
191
192 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
193
194 <p class=MsoNormal>The Definition of NULL starts with the CIM Specification
195 that specificies<br style='mso-special-character:line-break'>
196 <![if !supportLineBreakNewLine]><br style='mso-special-character:line-break'>
197 <![endif]></p>
198
199 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
200
201 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
202
203 <p class=MsoNormal>Thus we have a clear demand to implement the concept of Null
204 in at least the following</p>
205
206 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
207
208 <p class=MsoNormal>Internally</p>
209
210 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
211 karl 1.1
212 <p class=MsoNormal>All CIMValues</p>
213
214 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
215
216 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
217
218 <p class=MsoNormal><b>Usage of Null values in HTTP Operations and XML
219 specificaitons<o:p></o:p></b></p>
220
221 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
222
223 <p class=MsoNormal>The following sections are clipped from the DMTF
224 Specifications with annotations. As a general comment, they indicate that Null
225 is indicated by lack of the <VALUE> or <VALUE.ARRAY> tags.<span
226 style="mso-spacerun: yes"> </span>Note that there is no indication what the
227 meaning of the pairs with NO data is (ex. <VALUE></VALUE>.</p>
228
229 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
230
231 <h2>From the XML Specification Section 2.4</h2>
232 karl 1.1
233 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
234
235 <p class=MsoNormal>This notation uses the NULL qualifier to indicate parameters
236 whose values may be be specified as NULL in a method call. A NULL (unassigned)
237 value for a parameter is specified by an <IPARAMVALUE> element with no
238 subelement. For parameters which do not possess the NULL qualifier, the CIM
239 Client MUST specify a value for the parameter by including a suitable
240 subelement for the <IPARAMVALUE> element for that parameter.</p>
241
242 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
243
244 <p class=MsoNormal><b>The XML specification specificies the use of Value as
245 follows:<o:p></o:p></b></p>
246
247 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
248
249 <p class=MsoNormal><b>3.2.5.3. QUALIFIER<o:p></o:p></b></p>
250
251 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
252
253 karl 1.1 <p class=MsoNormal>The QUALIFIER element defines a single CIM Qualifier. If the
254 Qualifier has a non-array type, it contains a single VALUE element representing
255 the value of the Qualifier. If the Qualifier</p>
256
257 <p class=MsoNormal>has an array type, it contains a single VALUE.ARRAY element
258 to represent the value.</p>
259
260 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
261
262 <p class=MsoNormal><span style="mso-spacerun: yes"> </span><!ELEMENT
263 QUALIFIER (VALUE|VALUE.ARRAY)></p>
264
265 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
266
267 <p class=MsoNormal>NOTE: That either a VALUE or VALUE.ARRAY is required. <span
268 style="mso-spacerun: yes"> </span>There is no possibility of a Null option
269 here. <span style="mso-spacerun: yes"> </span>Thus, it is implied that there is
270 no possibility for a Null value in a qualifier.</p>
271
272 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
273
274 karl 1.1 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
275
276 <p class=MsoNormal><b>3.2.5.4. PROPERTY<o:p></o:p></b></p>
277
278 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
279
280 <p class=MsoNormal>The PROPERTY element defines a single (non-array) CIM
281 Property that is not a reference. It contains a single VALUE element<span
282 style="mso-spacerun: yes"> </span>representing the value of the Property.</p>
283
284 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
285
286 <p class=MsoNormal>If the Property has no assigned value then the VALUE element
287 MUST be absent.</p>
288
289 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
290
291 <p class=MsoNormal>CIM Reference Properties are described using the
292 PROPERTY.REFERENCE element.</p>
293
294 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
295 karl 1.1
296 <p class=MsoNormal><span style="mso-spacerun: yes"> </span><!ELEMENT PROPERTY
297 (QUALIFIER*,VALUE?)></p>
298
299 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
300
301 <p class=MsoNormal><b>3.2.5.5. PROPERTY.ARRAY<o:p></o:p></b></p>
302
303 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
304
305 <p class=MsoNormal>The PROPERTY.ARRAY element defines a single CIM Property
306 with an array type. It contains a single VALUE.ARRAY element<span
307 style="mso-spacerun: yes"> </span>representing the value of the Property.</p>
308
309 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
310
311 <p class=MsoNormal>If the Property has no assigned value then the VALUE.ARRAY
312 element MUST be absent.</p>
313
314 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
315
316 karl 1.1 <p class=MsoNormal>There is no element to model a Property that contains an
317 array of references as this is not a valid Property type according to CIM [1].</p>
318
319 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
320
321 <p class=MsoNormal><span style="mso-spacerun: yes"> </span><!ELEMENT
322 PROPERTY.ARRAY (QUALIFIER*,VALUE.ARRAY?)></p>
323
324 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
325
326 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
327
328 <p class=MsoNormal>3.2.5.6. PROPERTY.REFERENCE</p>
329
330 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
331
332 <p class=MsoNormal>The PROPERTY.REFERENCE element models a single CIM Property
333 with reference semantics. In future the features of XML Linking [4] may be used
334 to identify linking elements within</p>
335
336 <p class=MsoNormal>the XML Document; as XML Linking is currently only at
337 karl 1.1 Working Draft status no explicit dependencies have been made at this point.</p>
338
339 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
340
341 <p class=MsoNormal><span style="mso-spacerun: yes"> </span><!ELEMENT
342 PROPERTY.REFERENCE (QUALIFIER*,VALUE.REFERENCE?)></p>
343
344 <p class=MsoNormal><![if !supportEmptyParas]> <![endif]><o:p></o:p></p>
345
346 </div>
347
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