Update usage.md
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## Advanced usage
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**Error handling**
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**Syntax validation**
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When the parser encounters invalid syntax the **mermaid.parseError** function is called. It is possible to override this
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function in order to handle the error in an application-specific way.
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**Parsing text without rendering**
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It is also possible to validate the syntax before rendering in order to streamline the user experience. The function
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To validate syntax before rendering in order to streamline the user experience. The function
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**mermaid.parse(txt)** takes a text string as an argument and returns true if the text is syntactically correct and
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false if it is not. The parseError function will be called when the parse function returns false.
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