Validating xml schemas

Validating xml schemas

The document must be associated with at least one schema, and possibly more. All schema languages offer some tools for example, include and modularization control over namespaces and recommend reuse where practical. This makes it difficult to reason about schemas, for example to prove that a modification to a schema is backwards compatible.

Its sole purpose is to direct parts of documents to individual schemas based on the namespace of the encountered elements. So a namespace that does have a name can never be used as the default namespace. Validating with Multiple Namespaces Namespaces let you combine elements that serve different purposes in the same document without having to worry about overlapping names. When parsed, each element in the data set will be validated against the appropriate schema, as long as those schemas have been declared. This proved controversial, and was therefore dropped from the specification at a late stage of development.

Again the properties include the attribute name and target namespace. You also set a factory attribute to specify the parser language to use. You are seeing it here, because at this point you have learned enough about namespaces for the discussion to make sense.

In that way, only one copy of the schema will tend to exist. Configuring the DocumentBuilder Factory It is helpful to start by defining the constants you will use when configuring the factory. At the same time, this brings in issues of the choice of natural language.

We will take

Issue with Validating an Xml with the Schema Xsd

Although it technically is namespace-conformant, it does not seem to follow the namespace spirit e. It is also possible to mix the declarations. You do not specify the namespace name. In addition, wildcard particles are allowed, which permit a set of different elements perhaps any element provided it is in a certain namespace.

In general, though, it is a good idea to keep all the declarations together in one place. Other more specialized components include annotations, assertions, notations, and the schema component which contains information about the schema as a whole. There is no special declaration for the default unnamed schema.

Various parts of the extensive and sophisticated Text Encoding Initiative schemas are also re-used in an extraordinary variety of other schemas. What is new is the entry in the middle, which defines the locations of the schemas to use for each namespace referenced in the document. Compile the example class, using the class path you have just set. Schematron Schematron is a fairly unusual schema language. The latter mechanism requires the client invoking validation to trust the document sufficiently to know that it is being validated against the correct schema.

If a prefix

There are many surprises in the language, for example that restriction of elements works differently from restriction of attributes. Instead, you only give pointers to the. We will take a look at those next. If a prefix is defined for the tax namespace, and another prefix defined for the hiring namespace, then the personnel data could include segments like the following. An attribute use represents the relationship of a complex type and an attribute declaration, and indicates whether the attribute is mandatory or optional when it is used in that type.

Instead you only give

Element declarations may be global or local, allowing the same name to be used for unrelated elements in different parts of an instance document. These include the element name and target namespace. Attributes typically represent information associated with the entirety of the element on which they occur, while sub-elements introduce a new scope of their own.

Namespace Routing Language This is not technically a schema language. Note, too, that in this example there is a default namespace that the unqualified element names employee and name belong to. Twenty-five derived types are defined within the specification itself, and further derived types can be defined by users in their own schemas. Once again, use the file personal.

For the document to be properly validated, the schema for that namespace must be declared, as well as the schemas for the tax and hiring namespaces. Model group and attribute group definitions.

An attribute use represents theThere are many

This is done by calling the setValidating method on the DocumentBuilderFactory instance dbf, that was created in Instantiate the Factory. These are described in the following section. For example, it would be unusual to create a schema where some element names are CamelCase but others use underscores to separate parts of names, or other conventions. You can help by adding to it.