Map Development Area (MDA)
Location:
_/_
markup
_/_
xml
_/_
validation
_/_
dtd
| dtd |
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Types:
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disadvantage
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no support for 'basic' data types -- or to build new data types
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Comment:
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defines the legal elements of an XML document: sub-elements and optional text within the element
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history
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invented along SGML, 1980'ies
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Comment:
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SGML originated language to define the structure of a document, document constraint language -- more a grammar than a data type definition language
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advantage
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compact, quite powerful
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advantage
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still wide-spread -- good software support
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disadvantage
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rather baroque language -- "ASN.1 of the Document Universe"
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disadvantage
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do not support name spaces -- more document oriented
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disadvantage
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is not in XML format (if that counts as a disadvantage)
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Comment:
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also specifies the 'start element' the document has to start with
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