DTD Tutorial


DTD Tutorial
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Description
The value of an attribute of ID type can contain only characters permitted for NMTOKEN and must start with a letter. No element
type may have more than one ID attribute specified. The value of an ID attribute must be unique between all values of all
ID attributes.
DTD
The attributes id, code and X uniquely determine their element:
<!ELEMENT XXX (AAA+ , BBB+ , CCC+)> <!ELEMENT AAA (#PCDATA)> <!ELEMENT BBB (#PCDATA)> <!ELEMENT CCC (#PCDATA)> <!ATTLIST AAA id ID #REQUIRED> <!ATTLIST BBB code ID #IMPLIED list NMTOKEN #IMPLIED> <!ATTLIST CCC X ID #REQUIRED Y NMTOKEN #IMPLIED>
Valid documentsTop
All ID values are unique :
<!DOCTYPE XXX SYSTEM "tutorial.dtd"> <XXX> <AAA id="a1"/> <AAA id="a2"/> <AAA id="a3"/> <BBB code="QWQ-123-14-6" list="14:5"/> <CCC X="zero" Y="16" /> </XXX>
The attributes list and Y are of type NMTOKEN not ID. They can have therefore the same value as ID attributes or to have the same value in several
elements :
<!DOCTYPE XXX SYSTEM "tutorial.dtd"> <XXX> <AAA id="L12"/> <BBB code="QW" list="L12"/> <CCC X="x-0" Y="QW" /> <CCC X="x-1" Y="QW" /> </XXX>
Documents with errorsTop
The ID attribute must not start with a number or contain a character not permitted in NMTOKEN:
<!DOCTYPE XXX SYSTEM "tutorial.dtd"> <XXX> <AAA id="L12"/> <BBB code="#QW" list="L12"/> <CCC X="12" Y="QW" /> </XXX>
The ID attribute must have a unique value:
<!DOCTYPE XXX SYSTEM "tutorial.dtd"> <XXX> <AAA id="L12"/> <BBB code="QW" list="L12"/> <CCC X="ZA" Y="QW" /> <CCC X="ZA" Y="QW" /> </XXX>
The ID attribute must have a unique value. Both id and X are of type ID:
<!DOCTYPE XXX SYSTEM "tutorial.dtd"> <XXX> <AAA id="L12"/> <BBB code="QW" list="L12"/> <CCC X="L12" Y="QW" /> </XXX>
содержание | 2 | Медсанчасть "Нефтяник" Придоставляет медицинские услуги поликлиники и отделения стационара. Лучшие специалисты
Используются технологии uCoz