Which are the namespaces in .net used for xml

As you can see, the association between the tags and their namespaces are always the same. The only things that are changed are the prefixes. My actual code uses XDocument and XElement classes to read the XML but it can be the way because I need to know the exact prefix for each tag and since they can vary, it works only with the first XML file sample. How can I read the XMLs without having to specify the namespace prefixes?

Should I use another. NET library or maybe a 3rd party one? No, you don't. The prefixes are entirely irrelevant to qualified name of an element or attribute. If you want to go the XPath route, then don't read the namespaces and prefixes from the document to create your namespace manager, specify them yourself so you know what they are. Then use those in your query.

For example, this will work with any of your XML documents:. What I would encourage, though, is that you ditch XPath.

And another quick hint, there is an overload of XDocument. Load that accepts a stream. There's no need to create the XmlReader. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. This example may declare a Namespace for an address. Using namespaces helps avoid name conflicts, organizes the XML and provides access control. An example of how to use namespaces is shown below:.

The above example defines two default namespaces. The first is defined within the purchaseOrder element and the other is defined within the address element.

All elements descending the purchaseOrder element will inherit the namespace. This also applies to all elements descending address element. Default Namespace, Prefixes and Qualified Names. The xmlns defines the default namespace and all its descendants. The scope of the namespace in address will only apply to address, address1, address2, town, county and postcode.

Using default namespaces can be complicated when many are declared within the XML tree. It is recommended to use prefixed namespaces. A qualified name assigns a prefix to an element that maps to a declared namespace. An element using a prefix is defined with two parts, a prefix and a local name separated with a : , e. All descendants of the address element should also be prefixed as shown in the example below:.

In the example above, the namespace declaration is moved to the purchaseOrder element. This is optional and can be declared within the address element. Adding the namespace gives the address namespace scope throughout the whole of the document and is not restricted to the address element.

It is not required to qualify all elements within the XML. You can rely on default namespace to determine the namespace for all elements not explicitly prefixed. This is shown in the example below:.

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R Programming. React Native. Python Design Patterns. Python Pillow. Python Turtle. Verbal Ability. Interview Questions. Company Questions. Artificial Intelligence. Cloud Computing. Also note that when you use the System. Xml types and members, if the XML contains data that has potential privacy implications, you need to implement your app in a way that respects your end users' privacy.

Several XML technologies have the ability to retrieve other documents during processing. For example, a document type definition DTD can reside in the document being parsed. The DTD can also live in an external document that is referenced by the document being parsed. These external resources can present some security concerns. For example, you'll want to ensure that your app retrieves files only from trusted sites, and that the file it retrieves doesn't contain malicious data.

You can override this class and specify the XmlResolver object to use. Use the XmlSecureResolver class if you need to open a resource that you do not control, or that is untrusted. The following scenarios are considered to be less vulnerable to denial of service attacks because the System. Xml classes provide a means of protection from such attacks. DtdProcessing set to DtdProcessing. The following scenarios are not recommended if you are concerned about denial of service attacks, or if you are working in an untrusted environment.

Schema processing. This includes adding an untrusted schema to the schema collection, compiling an untrusted schema, and validating by using an untrusted schema. DOM operations such as querying, editing, moving sub-trees between documents, and saving DOM objects. If you are concerned about denial of service issues or if you are dealing with untrusted sources, do not enable DTD processing.

This is disabled by default on XmlReader objects that the XmlReader. Create method creates. Use the XmlTextReader. DtdProcessing property to disable this feature. You can also design your app so that the XML processing is memory and time constrained. For example, you can configure timeout limits in your ASP.

NET app. Because XML documents can include references to other files, it is difficult to determine how much processing power is required to parse an XML document. If the DTD contains nested entities or complex content models, it could take an excessive amount of time to parse the document.

When using XmlReader , you can limit the size of the document that can be parsed by setting the XmlReaderSettings. MaxCharactersInDocument property. You can limit the number of characters that result from expanding entities by setting the XmlReaderSettings. MaxCharactersFromEntities property. See the appropriate reference topics for examples of setting these properties. For example, it is possible to construct an XML schema that requires a substantial amount of time to process when evaluated over a relatively small document.

It is also possible to embed script blocks within an XSLT style sheet. Both cases pose a potential security threat to your app. When creating an app that uses the XslCompiledTransform class, you should be aware of the following items and their implications:.

XSLT scripting is disabled by default.