The normal QRS axis, like the P wave axis, points downward and to the left within a coordinate between -30 o and +90 o. This axis is said to be deviated to the left (left axis deviation or LAD) if it lies between -30 o and -90 o; and deviated to the right (right axis deviation or RAD) if it lies between +90 o and 180 o.
Schema.org Structured Data. Schema.org (often called Schema) is a specific vocabulary of tags (or microdata) that you can add to your HTML to improve the way your page is represented in SERPs.chema.org (often called Schema) is a specific vocabulary of tags (or microdata) that you can add to your HTML to improve the way your page is represented in SERPs.
Don't let the term schema intimidate you. A schema is just an XML file that contains the rules for what can and cannot reside in an XML data file. Schema files typically use the .xsd file name extension, while XML data files use the .xml extension.Schemas allow programs to validate data.on't let the term schema intimidate you. A schema is just an XML file that contains the rules for what can and cannot reside in an XML data file. Schema files typically use the .xsd file name extension, while XML data files use the .xml extension.