# 22. Virtuoso Functions Guide - XMLType.isFragment

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XPATH & XQUERY
Functions Index

## XMLType.isFragment

The function returns 1 if the instance is an XML generic entity or 0 if it is a plain document.
XMLType.isFragment
Description

The function checks the number of children elements of the root of the document root of the given instance. If there are no such documents or there are many of them then the document is not well-formed, for example it can not be fully validated against an XML schema. However it can be used as a fragment of a larger document: it can be declared as an external generic entity and then referenced in a top-level document or in one of its subdocuments. For example a book can be stored in XML as a root document that includes subdocuments, one or more chapter per subdocument.

The function returns 1 if the given XMLType instance is a fragment and returns 0 if it is a well-formed XML document.

Return Types

Integer value 1 or 0.

Examples
Basic test

The table DB.DBA.SYS_USERS always contains more than one user record so the call of XMLAGG that returns one element per record creates an valid generic entity but not a valid document.

    select XMLAGG (XMLELEMENT ("User",U_NAME)) from DB.DBA.SYS_USERS;
    callret
    VARCHAR
    _______________________________________________________________________________

    <User>BACKUP</User><User>SOAP</User><User>dba</User><User>demo</User>

    1 Rows. -- 00000 msec.
    select XMLType (XMLAGG (XMLELEMENT ("User",U_NAME))).isFragment() from DB.DBA.SYS_USERS;
    callret
    INTEGER
    _______________________________________________________________________________

    1

    1 Rows. -- 00000 msec.

See Also

XMLType.getRootElement()