XML Model Glossary
union | Derivation of a simple type to restrict its values to a collection of |
| simple data types |
unique | An identity constraint used to specify that an element or attribute value (or set |
| of values) must be unique or null within a specified scope |
URI | Uniform Resource Identifier. A string of characters which identifies an |
| Internet resource |
XDR | |
| file. It is a simplified XSD (or schema) |
XML | Extensible Markup Language. Used for structuring documents with self- |
| describing tags in plain text format |
XML language | Language used to define the structure of an XML model. It can be Document |
| Type Definition 1.0 or XML Schema Definition 1.0 |
XPath | XML Path Language. A language to address parts of an XML document |
| For more information on XPath, see XPath abbreviated syntax in |
| section Defining an identity constraint selector, in chapter Building an XML |
| model |
XSD | XML Schema Definition (or schema). An XML language defining the |
| structure of an XML file. It supports namespaces and datatypes |
270 | PowerDesigner |