Validating well-formed XML files

PEDI offers different options for validating XML documents, including the validation of a well-formed document. The structure of an XML document is formed by tags that begin with the character < and end with the character >. In an XML document, you can find start tags <example tag>, end tags </example tag>, or empty element tags <example tag/>, and these tags can be nested. An XML document is called well-formed when it follows the following set of rules:

• They must contain at least one element.

• They must contain a unique root element—this means a single opening and closing tag for the whole document.

• The tags are case sensitive—this means that beginning and ending tags match (for instance, <example Tag></example Tag> versus <example Tag></Example Tag>). The second tag set will throw an error.

• All of the tags must be nested properly, without overlapping.

  Tip

  There is a lot more that goes into consideration around what...