Prerequisites. • HTML. • Editing XML (being able to use a simple DTD). Availability url: soundofheaven.info and also as a PDF document. 2. Please forward Linking an XML file to an external DTD. . 2 soundofheaven.info 3. Tutorial 6 - XML DTD. CSC - Introduction to Databases. Fall TA: Lei Jiang. XML DOCTYPE Internal DTD. XMLDocument Type Declaration - define your.
|Language:||English, Spanish, Hindi|
|Genre:||Children & Youth|
|ePub File Size:||19.44 MB|
|PDF File Size:||14.69 MB|
|Distribution:||Free* [*Regsitration Required]|
An XML document is not required to have a corresponding DTD. However DTDs are introduced into XML documents using the document type declaration ( i.e. Introduction. In this section we introduce the notion of semi-structured data . XML. XML Document Type Declaration, commonly known as DTD, is a way to An XML DTD can be either specified inside the document, or it can be kept in a.
Inlining h! After you save the document as an XML file, the Heading1 content can be imported and put to use—by any application that can read XML—as a web page, printed catalog, directory, price list, or database table. Related work is One way to satisfy these requirements is using relational given in Section 3. We have conf code, id, title, year, mon, day, mary key for each relation. Adobe InCopy User Guide. The following is the DTD for a Conference e1,e2?
You can see the structure of XML data in the Structure pane, which displays the hierarchy and sequence of elements.
In the XML structure, child elements are contained by parent elements, which in turn may also be child elements. Or, seen from the other direction, parent elements contain child elements, and these child elements may in turn be parent elements to other child elements.
For example, in the following image, you can see a chapter element that contains is the parent of several recipe elements. Each recipe element, in turn, is the parent of elements called recipename , ingredients , instructions , notes , and servings.
All elements are contained inside the Root element, which appears at the top of the Structure pane. For example, in the following image, you can see a chapter element that contains is the parent of a recipe element. The recipe element, in turn, is the parent of elements called recipename and ingredients.
All elements are contained inside the Story element, which always appears at the top of the Structure pane. The Structure pane displays all the elements in the document and their hierarchical structure. To help you identify each element, InCopy displays its element tag and an icon that indicates what type of content it holds.
In addition, the Structure pane can display the first few words of text in an element, called a text snippet , which is not to be confused with snippet files that store objects for reuse. The Structure pane lets you view, edit, and manage XML elements. You use the Structure pane in many ways when working with XML. For example, to place imported XML content into the layout, you can drag elements from the Structure pane directly to a page.
You also use the Structure pane to adjust the hierarchy of the elements. You can add elements, attributes, comments, and processing instructions by way of the Structure pane. The Tags panel lists tags for elements. You can import, export, add, delete, and rename tags.
You use the Tags panel to apply element tags to content that you plan to export to XML, and to apply tags to frames before importing XML content into them. You use the Tags panel to apply element tags to content that you plan to export to XML. To share XML data with others, you need to agree on a standard set of tag names and element attributes so that everyone in your group uses and applies tags the same way.
A DTD file provides a set of elements and attributes for members of the group to use. It also defines the rules about where elements can appear in the structural hierarchy.
For example, the DTD file may require the Title element to be a child of the Story element because the title is supposed to appear inside the story; if you tag a title without tagging the story it appears in, the DTD file marks the Title element as invalid. This process is called validating. This imports the element names from the DTD into the Tags panel. Others who have loaded the same DTD file have the same element names, which ensures that everyone in the group uses the same elements.
You can view the DTD file in InCopy and validate stories against it to ensure that tags have been applied correctly. You may find that a DTD file created by a group or industry similar to yours includes tags and structures that meet your needs.
Introduction ements , 7 handling the union type or , 8 capturing the order specified in the XML model. XML is an emerging standard for the representation and exchange data over the internet.
As such, XML tags allow to describe the meaning of the content itself. New First we define XSchema, a language independent for- tags and attribute names can be defined, document struc- malism to specify XML schemas.
Relational databases are par- types e. As a query language, SQL is designed specifi- with specification of data types, attribute definitions, and in- cally to query structured data.
RDBMS are also the values. An XSchema is denoted by 5-tuple can be accessed by a very large number of concurrent users. Relational systems were never designed to handle semi- structured content often stored as XML. The following is the DTD for a Conference e1,e2?
Inlining h! Inlining is used to h! Inlining for an element e is done recursively us- h! The inlining technique also takes as input h!
Let the elements which occurs in M currEl with oc- P conf: For each ei , do the following.
Return ResultSet. So the paper table will be The inlining technique is applied to the top elements which paper code, id, title, contact, author, cite id, cite format, are determined by the following rules: An element which does not appear in any other ele- 4.
A non PCDATA element which appears in more the paper table in person table and remove the author than one other element type definition. So the person table will be Rule3: If recursion occurs, one of the elements in the recur- sion is selected as a top elements. According to the above rules we find that the element nodes are conf according to rule 1 , paper ac- 1. An IDREF attribute is mapped by replacing it by a cording to rule 3, 5 and person according to rule 3 , so foreign key.
We have an IDREF attribute defined for con- obtain the following relation definitions tact, which refers to person. So The result of our mapping conf id, title, year, mon, day, editor , paper id, title, con- is defining the contact attribute in paper table as a foreign tact, author, cite id, cite format , person id, fn, ln, email, key refers to person table.
IDREFS attributes are mapped by creating a new table contains a foreign key to the referenced table and a foreign 2. We have conf code, id, title, year, mon, day, mary key for each relation. So we create a new table editor conf, person tact, author, cite id, cite format , person code, id, fn, ln, and remove the editor attribute form conf table, so conf email, phone. Mapping collection types 2.
Handling the union type 1. If there is a table corresponding to the collection type In this step, if we find more than one attribute that may , then add a foreign key refers to the table that represent or be NULL in a table say a1, a2, do the following step contains its parent.
Replace them with two attributes, one of them as 2. Else create a new table corresponding to the collection a flag attribute and the second for values its name type, and add a foreign key refers to the table that represent is a1 a2 or contains its parent. Add the flag attribute to the key of the table. If the parent of the collection type say e is an attribute Example 8. So the paper per. Capturing order specified in the XML model 2. With Dewey 3.
We store the 4.
DTD to relational schema both in structural and semantic Example 9. For DTD conference, We create the following aspects. The technique described how the various defini- tables: Abiteboul, P. Buneman, and D.
Data On the 1.