# Structuring macros, metadata, and other value-pairs _Available in AxoSyslog 3.3 and later._ The AxoSyslog application allows you to select and construct name-value pairs from any information already available about the log message, or extracted from the message itself. You can directly use this structured information, for example, in the following places: * [`amqp()`](../../docs/axosyslog-core/chapter-destinations/configuring-destinations-amqp/index.md) destination * [`format-welf()`](../../docs/axosyslog-core/chapter-manipulating-messages/customizing-message-format/reference-template-functions/index.md) template function * [`mongodb()`](../../docs/axosyslog-core/chapter-destinations/configuring-destinations-mongodb/index.md) destination * [`stomp()`](../../docs/axosyslog-core/chapter-destinations/configuring-destinations-stomp/index.md) destination * or in other destinations using the [format-json()](../../docs/axosyslog-core/chapter-manipulating-messages/customizing-message-format/reference-template-functions/index.md) template function. When using `value-pairs`, there are three ways to specify which information (that is, macros or other name-value pairs) to include in the selection. * Select groups of macros using the `scope()` parameter, and optionally remove certain macros from the group using the `exclude()` parameter. * List specific macros to include using the `key()` parameter. * Define new name-value pairs to include using the `pair()` parameter. These parameters are detailed in [value-pairs()](../../docs/axosyslog-core/chapter-concepts/concepts-value-pairs/option-value-pairs/index.md). * * * [Specifying data types in value-pairs](../../docs/axosyslog-core/chapter-concepts/concepts-value-pairs/specifying-data-types/index.md) [value-pairs()](../../docs/axosyslog-core/chapter-concepts/concepts-value-pairs/option-value-pairs/index.md) Last modified September 2, 2023: [Fixes xrefs and formatting errors (ecec42e)]()