By S.J. DeRose
The SGML FAQ publication: realizing the basis of HTML and XML is identical, yet no longer rather a similar type of factor as a web FAQ or `Frequently requested Questions' checklist. It addresses questions from those that already really use SGML ultimately (including HTML authors), and those that are approximately to take advantage of it. It offers mostly with matters that come up while utilizing SGML in perform. a really short advent to SGML is incorporated as Appendix A. The questions mentioned within the SGML FAQ ebook are many times heard by means of those that make their dwelling serving the SGML group. SGML specialists spend many hours educating those info, occasionally many times simply because a few questions don't appear very important -- till you run into them. So one good thing about this ebook is studying extra of the artwork of record construction and administration, either by way of common analyzing sooner than questions come up and by way of particular reference while a question arises. For the latter use, the appendices, thesaurus, and index are really very important. A moment good thing about this e-book is that it presents a standard subject matter to its solutions so you might practice on your use of SGML, HTML and similar languages mostly. the basic solution to a few of the questions boils right down to `simplify': many questions don't appear for those who use the easy, based middle of SGML with no caring approximately not obligatory positive factors. The credo of this booklet is just, `SGML does not must be complicated'. SGML has the possibility of complexity at convinced issues. yet a lot of the complexity comes from non-compulsory elements and will be shunned. SGML method and its basic advantages endure no loss even should you bypass many good points, which speaks good for the standard of SGML's total layout. a number of the questions mentioned contain these non-compulsory elements, and hence might be refrained from by means of really apt designers and authors. the 2 key targets of the ebook are (1) to reply to questions that you could be really stumble upon as an SGML consumer, and that will help you get `unstuck' and be as effective as attainable in utilizing the language and (2) to teach proactive methods you could simplify your use of SGML, and get its very mammoth merits with minimum complexity.
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Extra resources for The SGML FAQ Book: Understanding the Foundation of HTML and XML
Such redefinition is tempting as an easy way to allow extra characters, but can be confusing because your logical IDs are no longer syntactically NAMEs as true SGML IDs are. ATTLIST ID TYPE XREF CDATA NAME #REQUIRED #IMPLIED> I But after such a change it is very easy to forget that the change made the attributes caseand whitespace-sensitive. That may lead to hyperlinks that fail later on because the destination's CDATA attribute doesn't exactly match the case of the origin's. Software that just obeys the parsing rules then cannot locate the intended destination; it must do some extra work on its own.
Between #CURRENT attribute instances. Authors might expect that if they merely copy the "ad" as shown below, the CHAP break "resets" SECURE, but in SGML it does not. It is especially easy to assume this without realizing 24 DeRose it when each chapter has a different author.This happens even if CHAP declares a S E C U R E attribute. 15, #CURRENT attributes share their "current" value across different element types if (and only if) they share the same SGML ATTLIST declaration. ATTLIST SECURE <[ATTLIST SECURE CHAP (SECRET P (SECRET I SHARED) #CURRENT> I SHARED) #CURRENT> Even with shared values, however, CHAP does not override P.
In those rare cases the " & l t ;" will not be recognized as marking an entity reference, so cannot be used to get the desired effect. The related RCDATA constructs are similar except that entity references are still recognized. Some very sophisticated SGML software may manage all this for you; if you are fortunate enough to use such software you needn't bother learning which element types or other constructs in the DTDs and documents you use are of type CDATA. Note: References to special-character entities such as " & l t l " and "&" are usually the I easiest way to deal with any of the cases where a character or string that you want as literal text I content would otherwise be taken as markup.