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Because XML can be customized with tags, the set of tags defined by each person will be different. If there is no set of standards to stipulate the definition principles of tags, the application cannot process XML documents. The solution to this problem is to use DTD, DTD (Document Type Definition), which is used to define the writing rules of XML documents. Such as which elements can appear in the document, and the content and attribute requirements of the elements, etc. The application will use this DTD to verify the document. XML documents that comply with the DTD constraint rules are called valid documents and can be processed in the next step. Otherwise, an error will be reported. The application can capture the error and perform corresponding exception handling. The verification process is optional and depends on the specific application. To use a DTD for validity checking in a document type declaration, you must use a document type definition declaration to specify the DTD. For example:
1. Detailed introduction to XML document types
##Introduction: Since XML can be customized with tags, the set of tags defined by each person will be different. If there is no set of standards to stipulate the definition principles of tags, the application cannot process XML documents. The solution to this problem is to use DTD, DTD (Document Type Definition), which is used to define the writing rules of XML documents. Such as which elements can appear in the document, and the content and attribute requirements of the elements, etc. The application will use this DTD to verify the document. The XML document that conforms to the DTD constraint rules is called a valid document...
2. JavaScript Enhancement Tutorial—jQuery - Get content and attributes
Introduction: jQuery has powerful methods for manipulating HTML elements and attributes. jQuery DOM operation A very important part of jQuery is the ability to operate DOM.
3. JavaScript Enhancement Tutorial - Obtaining Content and Attributes
## Introduction: This article is the official HTML5 training tutorial of H5EDU organization. It mainly introduces: JavaScript enhancement tutorial - Get content and attributes jQuery - Get content and attributes jQuery has a powerful method to operate HTML elements and attributes. jQuery DOM manipulation A very important part of jQuery is the ability to manipulate DOM. jQuery provides a set of DOM-related methods that make it easy to access and manipulate elements and attributes. lamp DOM = ...
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jQuery Get Content and Attribute Methods and Examples_jquery
Introduction: There are three simple and practical methods for obtaining content: text(), html() and val(), and the attr() method for obtaining attributes. There is a good example below. Interested friends can refer to it5.
jQuery Get Content and Attributes Sample Code_jquery
Introduction: Get content - text(), html() and val() , the attr() method is used to obtain attribute values. There is a good example below. Interested friends can refer to6.
Javascript traversing Html Table example (including content and attribute values)_javascript skills
Introduction: This article mainly introduces how Javascript traverses the Html Table (including content and attribute values). Friends who need it can refer to itThe above is the detailed content of Recommended articles related to content and attribute usage. For more information, please follow other related articles on the PHP Chinese website!