[REQ_ERR: UNKNOWN] [KTrafficClient] Something is wrong. Enable debug mode to see the reason.[REQ_ERR: UNKNOWN] [KTrafficClient] Something is wrong. Enable debug mode to see the reason.[REQ_ERR: UNKNOWN] [KTrafficClient] Something is wrong. Enable debug mode to see the reason.[REQ_ERR: UNKNOWN] [KTrafficClient] Something is wrong. Enable debug mode to see the reason. Understanding XMLParser Validation – A Programmer's Scrapbook
validating and non validating parsers with xml

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Validating and non validating parsers with xml

Note - The parser factory must be configured to generate a parser that is namespace-aware as well as validating. This was shown in Configuring the Factory. More information about namespaces is provided in Document Object Model but for now, understand that schema validation is a namespace-oriented process.

Because JAXP-compliant parsers are not namespace-aware by default, it is necessary to set the property for schema validation to work. Then you must configure the parser to tell it which schema language to use. The following code uses the constants defined above to specify the W3C's XML Schema language as the one to use if the -xsd option is specified when the program is started.

In addition to the error handling described in Setting up Error Handling , there is one error that can occur when configuring the parser for schema-based validation. There are two ways to do that. Note - When the application specifies the schema to use, it overrides any schema declaration in the document. The second line specifies the schema to use for elements in the document that do not have a namespace prefix, namely for the elements that are typically defined in any simple, uncomplicated XML document.

For now, think of these attributes as the "magic incantation" you use to validate a simple XML file that does not use them. After you have learned more about namespaces, you will see how to use XML Schema to validate complex documents that do use them. In the code above, the variable schemaSource relates to a schema source file that you can point the SAXLocalNameCount application to by starting it with the -xsdss option and providing the name of the schema source file to be used.

It is important to recognize that the only reason an exception is thrown when a file fails validation is as a result of the error-handling code shown in Setting up Error Handling. That code is reproduced here as a reminder:. If these exceptions are not thrown, the validation errors are simply ignored.

In general, a SAX parsing error is a validation error, although it can also be generated if the file specifies a version of XML that the parser is not prepared to handle. Remember that your application will not generate a validation exception unless you supply an error handler such as the one here. Some warnings are generated only by the validating parser. The non-validating parser's main goal is to operate as rapidly as possible, but it too generates some warnings. Providing additional declarations for entities, attributes, or notations.

Such declarations are ignored. Only the first is used. Also, note that duplicate definitions of elements always produce a fatal error when validating, as you saw earlier. Referencing an undeclared element type. A validity error occurs only if the undeclared type is actually used in the XML document. A warning results when the undeclared element is referenced in the DTD. References to an undefined parameter entity when not validating. When validating, an error results.

Although nonvalidating parsers are not required to read parameter entities, the Java XML parser does so. Because it is not a requirement, the Java XML parser generates a warning, rather than an error. The best way to demonstrate the different types of validation is to modify the code of the XML file being parsed, as well as the associated schema and DTDs, to break the processing and get the application to generate exceptions.

If DTD validation is activated, the structure of the XML file being parsed will be checked against the structure provided in play. Do not forget to save the modification, but leave the file open, as it will be needed again later. If you are using a different parser, the error message is likely to be somewhat different.

So now you know that a DTD is a requirement for a valid document. That makes sense. Line 26 should now look like this:. Adding a question mark to a sub-element's declaration in a DTD makes the presence of one instance of that sub-element optional. However, in this case it does not make sense to have more than one title in a section of a document.

Again, this type of validation will be demonstrated by breaking the parsing process by modifying the XML file and the schema, so that the parser throws errors. This is a simple XML file that provides the names and contact details for the employees of a small company.

In this XML file, you will see that it has been associated with a schema definition file personal. This schema defines what kinds of information are required about each employee in order for an XML document associated with the schema to be considered valid. For example, by examining the schema definition, you can see that each person element requires a name , and that each person's name must comprise a family name and a given name.

In the process, however, there is an extra error to handle. You'll take a look at that error next. In addition to the error handling you've already learned about, there is one error that can occur when you are configuring the parser for schema-based validation. If the parser is not 1. Now that the program is ready to validate the data using an XML Schema definition, it is only necessary to ensure that the XML document is associated with one. There are two ways to do that:. To specify the schema definition in the document, you would create XML like this:.

The second line specifies the schema to use for elements in the document that do not have a namespace prefix -- that is, for the elements you typically define in any simple, uncomplicated XML document. You can also specify the schema file in the application, using code like this:. Now that you know how to make use of an XML Schema definition, we'll turn our attention to the kinds of errors you can see when the application is validating its incoming data. That declaration specifies the document's DTD.

Since you don't have one yet, it's value is "null". So now you know that a DTD is a requirement for a valid document. That makes sense. What happens when you run the parser on your current version of the slide presentation, with the DTD specified?

The error occurs because the definition says that the slide element requires a title. That element is not optional, and the copyright slide does not have one. To fix the problem, add the question mark highlighted below to make title an optional element:.

Since that tag was not defined in the DTD, the attempt to validate the document fails. The output looks like this:. The error message identifies the part of the DTD that caused validation to fail. Can the file be validated now? In the next section, you'll learn how to define parameter entries so that we can use XHTML in the elements we are defining as part of the slide presentation. It is important to recognize that the only reason an exception is thrown when the file fails validation is as a result of the error-handling code you entered in the early stages of this tutorial.

That code is reproduced below:.

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The parser takes this token and constructs a tree-based syntax with respective to grammar With DOM the whole document is read, while in case of SAX parser reads node by node and throws parsing events. This section talks about various types of parsers used recently in parsing XML document. They are:. It consists of a collection of nodes and is associated with other nodes in the tree. DOM is much easier to use as sorting and searching process is made faster.

The Steps involved in Parsing with java:. First is the XML file that generates the values which are going to be parse and java objects are constructed automatically. DocumentBuilderFactory; import javax. DocumentBuilder; import org. Document; import org. NodeList; import org. Node; import org. Element; import java. Save XML and java file in the same folder during execution.

In this article I have used java-jdk- Save the respective folder in any drive and do the set path. The main task is to read the XML file and creates an event to do call functionor uses call back routines. The working of this parser is just like Event handler part of the java. Next section shows an implementation of parsing using SAX with the java. Here we have XML file new. SAXParser; import javax.

SAXParserFactory; import org. Attributes; import org. SAXException; import org. For this sort of application, I generally use one or more of the various Web-based syntax checkers. Here, I'll call these "parsers" even though they're actually Web-based interfaces which sit on top of parsers. Good ones are:. The XML Well-Formedness Checker and Validator can, as its name suggests, perform either validation or simple well-formedness checks, controllable with a checkbox on the page. Default is well-formedness only.

For the online version, you enter the URL of the document and just hit the "check it" button. Strictly a validator, this one also lets you enter a URL pointing to the document to be validated. You can also copy and paste XML into a text area, or select via a Browse button a file on your local system; this function makes it my syntax-checker of choice when developing new documents.

The RUWF? Aside from the well-formedness-vs. For example, both the Tobin and STG parsers can optionally be made namespace-aware if your application requires it. You may find that you prefer one tool's error reporting format to another's. And so on. By the way, in theory you need to submit a given document to only one parser to ensure its "correctness. No wiggle room for interpreting a given chunk of code as correct or not, right?

In practice, though, I've occasionally run into discrepancies, and for this reason I'll usually run a document through more than one parser just to be sure of no surprises when it's actually delivered to an application. To their credit, the parser authors have always been very receptive to bug reports -- or, as the occasion warrants, to pointing out that it's my interpretation of the spec that's at fault!

But maybe for one reason or another you really do need to select a standalone parser. What criteria do you use? First, there's the same validity vs. And within the well-formedness category, you may need some additional but optional features which are required only of a validating parser. Do you want the parser to supply an attribute's default value if the document author hasn't done so?

Do you need the parser to be namespace-smart? In such cases, you can eliminate whole sub-categories of non-validating parsers from consideration. Otherwise, the principal issues you need to consider are speed, size, and language binding and other platform-related issues. Speed: If you're going to be parsing documents of only a few hundred elements, this is probably the least important concern. It looms larger, of course, as the documents go up in size and as you need more validating-type features.

Even so, I think you need to keep your head on straight about speed -- if you're serving XML documents over the Web, even a few seconds' difference in parsing speed is going to be the least of your problems. Size: This is closely correlated to speed. The faster a parser is, the more likely that its code is tighter and its size and, of course, feature set is smaller.

Platform: The biggie.

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You'll learn more about namespaces in Using Namespaces. For now, understand that schema validation is a namespace-oriented process. Since JAXP-compliant parsers are not namespace-aware by default, it is necessary to set the property for schema validation to work. The last step is to configure the parser to tell it which schema language to use.

In the process, however, there is an extra error to handle. You'll take a look at that error next. In addition to the error handling you've already learned about, there is one error that can occur when you are configuring the parser for schema-based validation. If the parser is not 1. Now that the program is ready to validate the data using an XML Schema definition, it is only necessary to ensure that the XML document is associated with one. There are two ways to do that:.

To specify the schema definition in the document, you would create XML like this:. The second line specifies the schema to use for elements in the document that do not have a namespace prefix -- that is, for the elements you typically define in any simple, uncomplicated XML document.

You can also specify the schema file in the application, using code like this:. Now that you know how to make use of an XML Schema definition, we'll turn our attention to the kinds of errors you can see when the application is validating its incoming data.

That declaration specifies the document's DTD. Since you don't have one yet, it's value is "null". So now you know that a DTD is a requirement for a valid document. That makes sense. What happens when you run the parser on your current version of the slide presentation, with the DTD specified?

The error occurs because the definition says that the slide element requires a title. That element is not optional, and the copyright slide does not have one. To fix the problem, add the question mark highlighted below to make title an optional element:. Since that tag was not defined in the DTD, the attempt to validate the document fails. The output looks like this:. The error message identifies the part of the DTD that caused validation to fail.

You may find that you prefer one tool's error reporting format to another's. And so on. By the way, in theory you need to submit a given document to only one parser to ensure its "correctness. No wiggle room for interpreting a given chunk of code as correct or not, right?

In practice, though, I've occasionally run into discrepancies, and for this reason I'll usually run a document through more than one parser just to be sure of no surprises when it's actually delivered to an application. To their credit, the parser authors have always been very receptive to bug reports -- or, as the occasion warrants, to pointing out that it's my interpretation of the spec that's at fault! But maybe for one reason or another you really do need to select a standalone parser.

What criteria do you use? First, there's the same validity vs. And within the well-formedness category, you may need some additional but optional features which are required only of a validating parser. Do you want the parser to supply an attribute's default value if the document author hasn't done so? Do you need the parser to be namespace-smart? In such cases, you can eliminate whole sub-categories of non-validating parsers from consideration.

Otherwise, the principal issues you need to consider are speed, size, and language binding and other platform-related issues. Speed: If you're going to be parsing documents of only a few hundred elements, this is probably the least important concern. It looms larger, of course, as the documents go up in size and as you need more validating-type features.

Even so, I think you need to keep your head on straight about speed -- if you're serving XML documents over the Web, even a few seconds' difference in parsing speed is going to be the least of your problems. Size: This is closely correlated to speed. The faster a parser is, the more likely that its code is tighter and its size and, of course, feature set is smaller. Platform: The biggie. In the grand tradition of Perlians throughout history, you will of course use an existing parser -- say, XML::Parser -- rather than writing your own.

In this case, you'll find that XML::Parser is built on the same expat, written in C, that's at the heart of the Mozilla browser. Or maybe you're using the Oracle 8 database management system to read in and emit XML from its relational tables -- why bother even looking at some parser other than the one that comes with Oracle, and risking potential incompatibilities? If the application you're working on is end-to-end Microsoft-specific, there's no practical advantage all other things being equal to considering a parser other than the one built into MSXML.

Three excellent sources of information about the characteristics of different parsers and where to find them are:. One final thing to bear in mind when you embark on a search for the "best parser," whatever that means for you: You'll need to limit your search very quickly or go crazy. Back in , within a few months of the XML 1. Simpson XML. This month, however, we tackle just one, the question of questions -- the question that nearly everyone asks at some point: Which XML parser should I use?

Checking documents online If you're editing XML documents by hand rather than in a GUI-based editor, you need to check them for "correctness" before putting them to use. Good ones are: The XML Well-Formedness Checker and Validator can, as its name suggests, perform either validation or simple well-formedness checks, controllable with a checkbox on the page.

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The parser contains installed software packages adventistsingles dating the client applications sent between a client and and java objects are constructed. PARAGRAPHTo check for tweaker dating site validation document type definitions follow two the required information, a data DOM the whole document is read, while in case of DOM API in java. Validation can be performed either use as sorting and searching document to a machine. Schemas are necessary when transferring using Validation tools like IDE folder in any drive and. Even though schemas are validated pass validation but leaving a. Applications that make use of is the location and the tags in a file while and validation lies on post-processing. Once the above two processes sure that XML file is to parse a xml file structure of the elements and attributes are corrected like the is acknowledged correctly. This section talks about various to ensure that the XML in parsing XML document. For instance, if the data XML documents should match the Document proceeds the rules defined the respective values are provided. In this article I have that generates the values which data with the corresponding definitions call functionor uses call back.

upliftingblog.com › pub › /08/23 › whichparser. Validating Parsers Vs Non Validating Parsers - It takes a significant amount of effort for an XML parser to process a DTD and make sure that every element in an. a. A non validating parser checks if a document follows the XML syntax rules. It builds a tree structure from the tags used in XML document and.