# Basic concepts ### Allowed characters The allowed characters are any kind of char that can be a part of the wrap. In this case it's a regular expression pattern that filters the [wrap](#wrap). ### Closing The closing consists of characters that indicates the closing of the wrap. ### Opening The opening consists of characters that indicates the opening of the wrap. ### Text The text to wrap with the opening, and the closing or to check whether it is wrapped. ### Wrap As a **noun**, in this case, wrap consists of the **opening**, and the **closing**. As a **verb**, in this case, wraps the specified text around. The opening of the wrap is added **before** and the closing **after** the text. ### Wrapped It is the text consists of a wrap opening at the beginning and closing at the end. ### Wrapper A wrapper is an object consisting of a wrap, which can wrap the specified text around. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.angular-package.dev/text/wrapper/basic-concepts.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.