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Chapter Eleven — SGML Functions (continued)

11.3.10 DTD and Schema

The DTD or Document Type Definition defines the elements, attributes, values and structure of SGML and HTML. XML can use a DTD but normally uses a schema (XSD). The DTD Object consists of the following components:

The DTD Manager contains the logic to load well known DTD information, search for and enumerate terms using tokens, validation (as attached to the well-known DTD) and logic to manage namespaces and DOCTYPE information. Not shown and as part of the DTD Token Lists are the CSS Properties List and named character entities. Since CSS properties, particularly inline CSS styles, are treated like SGML attributes, CSS properties are processed like attributes.

Namespaces are counted in two areas: as tokens for prefix names which are attached to elements and attributes and as as a list of prefixes and namespace URLs.

A DTD is attached to an SGML Object. If a DTD is not specified, the default is HTML 5. CSS, while not defined within a DTD, is part of the DTD functions. The following table lists the currently built in DTDs:

	Definition			Bitwise		Description
	DTD Designator
		DTD_CUSTOM		0x00000000		No Specific DTD Set or Custom
		DTD_DEFAULT_EDGAR_HYBRID		0x00000001		Default EDGAR Hybrid HTML 3.2
		DTD_DEFAULT_EDGAR_XHTML		0x00000002		Default XHTML/XBRL EDGAR 1.0/3.2
		DTD_DEFAULT_EDGAR_IXBRL		0x00000007		Default XHTML/iXBRL EDGAR 1.0/4.x
		DTD_DEFAULT_HTML_20		0x00000010		Default HTML 2.x
		DTD_DEFAULT_HTML_32		0x00000003		Default HTML 3.2
		DTD_DEFAULT_HTML_40_TRANSITIONAL		0x00000004		Default HTML 4.01 Transitional
		DTD_DEFAULT_HTML_40_STRICT		0x00000005		Default HTML 4.01 Strict
		DTD_DEFAULT_HTML_40_FRAMESET		0x00000020		Default HTML 4.01 Frameset
		DTD_DEFAULT_HTML_50		0x00000030		Default HTML 5.0
		DTD_DEFAULT_XHTML_10_TRANSITIONAL		0x00000006		Default XHTML 1.0 Transitional
		DTD_DEFAULT_XHTML_10_STRICT		0x00000050		Default XHTML 1.0 Strict
		DTD_DEFAULT_XHTML_10_FRAMESET		0x00000060		Default XHTML 1.0 Frameset
		DTD_DEFAULT_XHTML_11		0x00000080		Default XHTML 1.1 (strict)
		DTD_DEFAULT_XHTML_11_BASIC		0x00000090		Default XHTML 1.1 Basic
		DTD_DEFAULT_XSD		0x000000A0		Default XSD
	Flags
		DTD_XHTML_AS_XML		0x00000100		XHTML as XML (Wrapper)

 

Standard token values are located in the Legato SDK. Programmers should not hard code token values.

These functions allow translation of string names to DTD tokens. Version 1 of Legato SGML DTD does not allow for custom DTD specification.

DTD Specific Functions:

DTDCreateObject — Creates a DTD object.

DTDEnumerateAttributes — Enumerates a string table of attribute tokens.

DTDEnumerateElements — Enumerates a string table of element tokens.

DTDEnumerateNamespaces — Enumerates a string table of namespace tokens.

DTDEnumerateProperties — Enumerates a string table of CSS property tokens.

DTDGetCSSPropertyCase — Returns the tag case mode for CSS properties.

DTDGetNamespaces — Returns a list of specified namespace URLs and prefix key names.

DTDGetObject — Returns the DTD object associated with a specific with another object.

DTDGetProperties — Returns the properties associated with a specified DTD.

DTDGetTagCase — Returns the tag case mode for elements and attributes.

DTDParseDocType — Parses the specified object and returns doc type, schema and other meta data.

DTDParseTagCase — Parses the specified object and returns the discovered tag case.

DTD Functions Accessed Via SGML Object:

SGMLAttributeToString — Converts the attribute token to a string.

SGMLElementToString — Converts the element token to a string.

SGMLNamespaceToString — Converts the namespace token to a string.

SGMLPropertyToString — Converts a CSS property token to a string.

SGMLStringToAttribute — Converts the string version of an attribute name to a token value.

SGMLStringToElement — Converts the string version of an element name to a token value.

SGMLStringToNamespace — Converts the string version of a namespace to a token value.

SGMLStringToProperty — Converts the string version of a CSS property name to a token value.

 

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GoFiler Legato Script Reference — Generated on 10/21/2024

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