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How Is Metadata Used with XML?

April 26, 2017metadata Used XML

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How Is Metadata Used with XML?

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Metadata is used to define the structure of an XML document or file. Metadata is published in a Document Type Definition (DTD) file for reference by other systems. A DTD file defines the structure of an XML file or document. It is analogous to the Database Definition Language (DDL) file that is used to define the structure of a database, but with a different syntax. An example of an XML document identifying data retrieved from a PERSON database is illustrated in Figure 1. This includes metadata markup tags (surrounded by < >, such as ) that provide various details about a person. From this, we can see that it is easy to find specific contact information in , such as , , and (cell phone) numbers. Although we have not shown it here, the DTD also specifies whether certain tags must exist or are optional, and whether some tags can exist more than once — such as multiple and tags below.