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A DTD defines the structure of an XML document through element declarations that specify element types and attributes. It allows for uniformity across XML documents through constraints like requiring certain child elements. A DTD can be internal, embedded within the XML code, or external, stored separately in its own file. It uses markup declarations like <!ELEMENT> to define tags and their hierarchical tree structures.
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The document provides an overview of XML (eXtensible Markup Language). It discusses the need for separating presentation from content that led to the development of XML. XML allows adding structure and meaning to data through tags. It has various applications in almost every industry. The document then covers the key components of an XML document including the prolog, elements, attributes, entities, and DTD (Document Type Definition). It provides examples of element declarations, content models, and attribute declarations in a DTD. Finally, it describes the Together Control Center software which allows creating and editing XML diagrams and DTDs.Test for an issue
Test for an issuetechweb08
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The document provides an overview of XML (eXtensible Markup Language). It discusses the need for separating presentation from content that led to the development of XML. XML allows adding structure and meaning to data through tags. It has various applications in almost every industry. The document then covers the key components of an XML document including the prolog, elements, attributes, entities, and DTD (Document Type Definition). It provides examples of element declarations, content models, and attribute declarations in a DTD. Finally, it discusses Together Control Center, a software that allows creating and editing XML diagrams and DTDs.Chen's first test slides
Chen's first test slidesHima Challa
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The document provides an overview of XML (eXtensible Markup Language). It discusses the need for separating presentation from content that XML addresses. XML allows for structuring and adding semantic meaning to data. It also describes the main components of an XML document including the prolog, elements, attributes, entities, and DTD (document type definition). The DTD outlines rules for the document and enables validation. The document then explains various XML features in more detail such as content models, attribute declarations and types, internal/external DTDs, and entities. It concludes with an overview of the Together Control Center XML editor functionality.Tp2
Tp2B狸nh Tr畛ng n
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This document discusses XML DTDs and namespaces. It provides information on:
- The purpose of DTDs in defining the structure and elements of an XML document. DTDs can be internal or external.
- How to declare elements and attributes in a DTD using element and attribute declarations. Elements can contain child elements, character data, or be empty.
- The use of entities to reuse portions of text in a document. Entities can be internal or external.
- Namespaces are used to avoid conflicts between identically named elements from different sources. Namespaces are identified by URIs and prefixes are associated with namespaces.Jungahan web presentation
- 1. DTDA Document Type Definition =A set of structural rules, declarationsUse of DTD : impose uniform style sheet in external style sheet for XHTML Application program for testing document against the DTD
- 2. Internal , external DTDInternal DTD : embedded in the XML document External DTD stored in a separate filestructural uniformity across all of their documents
- 3. To avoid two different notations in the same document for debugging.A markup declaration<!keyword>ELEMENT : define tags.ATTLIST : define tag attributes.ENTITY : define entities.NOTATION : define data type notations.
- 4. Declaring Elements<!ELEMENT element_name (list of names of child elements)>Example)<!ELEMENT memo (from, to, data, re, body)>
- 5. Tree structurememofromtodatarebodyLeaf node, internal node : character pattern or a list of its child elements
- 6. Child element specification modifiers<!ELEMENT person (parent+, age, spouse?, sibling*)
- 7. Parsable character dataa string of any printable character except less than(<), greater than(>), and ampersand(&).<!ELEMENT element_name(#PCDATA)><!ELEMENT b (#PCDATA)> <!ELEMENT p (#PCDATA|a|b)*> EMPTY and ANY