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.
Schematron. An XML schema that is used to validate an XML document. Unlike grammar-based schema languages, Schematron is made up of XPath patterns that define the tree structures and relationships. It can be used by itself or embedded within a W3C XML Schema or RELAX NG schema. The final draft of an ISO version of Schematron was made available in late 2004 and was published as an ISO standard in 2006. For more information, visit www.schematron.com. See XML schema.