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used if, for example, similar prices in local currency were to be added for a number of European Union countries. If we apply this scenario to our simple book instance document so that it has a PubCountry attribute of the <Book> element, we see the result in Listing 1.10. Adding the PubCountry attribute means that the content of <Book> element is now of complex type. Listing 1.11 shows a schema to describe our modified instance document. As you can see, the mechanism of adding a single attribute to an element that has simple type content is pretty verbose in XSD Schema. If you follow the nesting within the <xsd:element>, you should grasp the logic. Because an attribute is present, the content in XSD Schema is complex type; therefore, we use the <xsd:complexType> element. The content of the <Book> element is a simple datatype, and therefore we use the <xsd:simpleContent> element. As well as the simple type content, however, an attribute is also present. Thus, the simple type content is extended, which is shown by the presence of the <xsd:extension> element. The specific nature of the extension is an attribute signaled by the presence of an <xsd:attribute> element nested within the <xsd:extension> element.

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and 2 is the power reflected from the external cavity relative to the power from the laser mirror. This is the same quantity that is represented in Equation (4.5) but normalized to the solitary laser cavity round-trip time. Additionally, the coupling fraction into the diode is assumed to be unity. For a DFB laser diode becomes complex and it has to be determined from a rather complicated nonlinear expression involving the details of the grating [38, 39]. However, here is assumed to be positive and real, and any possible phase can be included in the rather arbitrary phase 0 .

After you set the DVD drive to be first in the boot order, you need to save the settings. Again, how you do this will vary, but on most computers this will be labeled Save and Exit, Exit Saving Changes, or something similar (see Figure 5-3). After you configure your server to boot from DVD, place the Server Installation DVD in the drive, and power on the machine. If you are prompted to Press Any Key to Boot from CD-ROM, press a key on the keyboard to initiate booting from the DVD.

Finally, the UE performs another calculation in order to derive the temporary keys CK and IK from RAND and the Master Key. They are, if all goes well, the same as those sent by the HLR to the SGSN as part of the Authentication Vector. As a result the UE and SGSN share keys for integrity protection and encryption. The cryptographic functions involved in performing mutual authentication and for calculating the temporary keys are not standardized. The UMTS standard only suggests default algorithms as guidance. It suf ces for HLR and USIM to know the algorithms. Since this is a PLMN-internal issue there is no need for standardization. After completion of AKA, the SGSN proceeds to authorize the subscriber. To this end it pulls subscriber data from the HLR, as shown in Figure 11.7.

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Let s look at some publicly disclosed kernel-level vulnerabilities and work through various exploitation problems with real-life examples. Two OpenBSD kernel overflows (presented in Phrack 60, Article 0x6), one FreeBSD kernel information leak, and a Solaris design error are presented as case studies.

Diazomethane is attractive as a methylating agent for carboxylic acids and phenols because it reacts quickly and highly ef ciently with the production of only N2 as a by-product (Black, 1983). Its natural yellow color is discharged as it reacts, providing automatic indication of reaction progress. However, because diazomethane is highly toxic, it should be generated and used only in a well-functioning fume hood. Because it explodes on contact with groundglass of any type (joints, stoppers, syringes, stopcocks), it should be handled behind a safety shield, and other personal protective equipment should be used. Because it has a boiling point of 23 C, it is usually handled in the ethereal solutions in which it is generated. Because it explodes on contact with CaSO4, its solutions or vapors must never be dried with DRIERITE. Despite all of these hazards it can be worked with safely, provided that appropriate precautions are observed. Two main methods are used to prepare diazomethane. One uses commercially available apparatus speci cally designed for its preparation and distillation while entrained with ether. The resulting ether solution is typically of 0.3 to 0.4 m concentration and is diazomethane in its purest form. Such apparatus have specialized joints without ground glass and come in a range of sizes for generating diazomethane on scales of around 1, 50, or 300 mmol. The other method uses conventional glassware. Both methods use hydroxide to generate the

(5:18a) (5:18b) (5:18c)