added BindingWithGrammar.md to document vscode-xml grammar binding

docs/BindingWithGrammar.md

@@ -0,0 +1,114 @@
+# Binding with Grammar
+
+[vscode-xml](https://github.com/redhat-developer/vscode-xml) provides support for automatic XML schema/grammar binding through generation and/or using an existing `.xsd/.dtd` file.
+
+[Validation with XSD grammar](Validation.md#validation-with-xsd-grammar) and [Validation with DTD grammar](Validation.md#validation-with-dtd-grammar) provide more information on manual binding of an XML document.
+
+In the following sections, we would like to bind the XML document `foo.xml`:
+
+```xml
+<foo>
+  <bar />
+</foo>
+```
+
+with an associated grammar file.
+
+## Binding with Existing Grammar
+
+Consider an XSD document, `foo.xsd` file (in the same directory as foo.xml) defined as follows :
+
+```xsd
+<?xml version="1.0" encoding="UTF-8"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+  <xs:element name="foo">
+    <xs:complexType>
+      <xs:sequence>
+        <xs:element name="bar" />
+      </xs:sequence>
+    </xs:complexType>
+  </xs:element>
+</xs:schema>
+```
+
+This file (or a corresponding `.dtd` file) can be bound using the [XML Binding Wizard](#the-xml-binding-wizard), which can be triggered by [Command](#command), [CodeLens](#codelens) or [Quick Fix](#quick-fix).
+
+### The XML Binding Wizard
+
+After opening the binding wizard using one of the methods mentioned above, a dropdown with the following 2 options will appear at the Command Palette:
+
+![Binding Wizard Dropdown](./images/BindingWithGrammar/BindingWizardDropdown.png)
+
+1. Standard (xsi, DOCTYPE)
+
+This option will bind the grammar file by adding the `xmlns:xsi` (with the value as "http://www.w3.org/2001/XMLSchema-instance") and `xsi:noNamespaceSchemaLocation` (with the value as the path to the grammar file) attributes to the root tag:
+
+```xml
+<foo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:noNamespaceSchemaLocation="foo.xsd">
+    <bar />
+</foo>
+```
+
+2. XML Model association
+
+This option will bind the grammar file by adding the `xml-model` tag at the beginning of the file, with an `href` value as the path to the grammar file:
+
+```xml
+<?xml-model href="foo.xsd"?>
+<foo>
+    <bar />
+</foo>
+```
+
+After selecting an option, you can select the desired grammar file using your file explorer.
+
+### Command
+
+The command "XML: Bind to grammar/schema file" can be executed from the VSCode command palette, as well as be bound to a shortcut.
+
+![Bind To Grammar Command](./images/BindingWithGrammar/BindToGrammarCommand.png)
+
+If the current XML document is not bound using an `xml-model` tag or a root element doesn't have a `xsi:noNameSpaceLocation` attribute, the command will have the user select a existing `.xsd/.dtd` grammar file to bind to the XML document.
+
+Otherwise, an error will be thrown on the client if the XML document already has a bound grammar/schema.
+
+### CodeLens
+
+When [CodeLenses](./Preferences.md#code-lens) are enabled, an unbound XML document will display a CodeLens above the root element as follows:
+
+![Bind To Grammar Command](./images/BindingWithGrammar/BindToGrammarCodeLens.png)
+
+### Quick Fix
+
+For any unbound XML document, a Quick Fix suggestion will appear beside the root element.
+
+![Bind To Grammar CodeAction](./images/BindingWithGrammar/BindToGrammarCodeAction.png)
+
+With the cursor on the first opening tag, use `Ctrl + .`, `Quick Fix...` or the lightbulb that appears and select the "Open binding wizard to bind existing grammar/schema"
+
+![Bind To Grammar CodeAction Dropdown](./images/BindingWithGrammar/BindToGrammarCodeActionDropdown.png)
+
+## Binding with New Grammar
+
+Consider the case where the directory only contains `foo.xml` (i.e. there does not exist an appropriate `.xsd/.dtd` file to bind).
+
+A file can be generated using a [Quick Fix](#quick-fix-1).
+
+### Quick Fix
+
+#### Generate XSD from XML
+
+When an unbound XML file is open, an XML Schema/XSD file can be generated from the opening tag in the XML file.
+
+With the cursor on the first opening tag, use `Ctrl + .` or `Quick Fix...` or the lightbulb that appears and select "Generate foo.xsd and bind with *" to create the file in the the same directory.
+
+![GenerateXSDFromXML](./images/BindingWithGrammar/GenerateXSDFromXML.gif)
+
+#### Generate DTD from XML
+
+When an unbound XML file is open, a Document Type Definition/DTD file can be generated from the opening tag in the XML file.
+
+With the cursor on the first opening tag, use `Ctrl + .` or `Quick Fix...` or the lightbulb that appears and select "Generate foo.dtd and bind with *" to create the file in the the same directory.
+
+![GenerateDTDFromXML](./images/BindingWithGrammar/GenerateDTDFromXML.gif)

docs/Features/XMLFeatures.md

@@ -126,27 +126,13 @@ There is also validation based on grammar when a XSD or DTD file is associated w
 
 See [XML Validation](../Validation.md#xml-validation) for more details.
 
-## Generate Grammar from XML
+## Binding Grammar to an XML Document
 
-### Generate XSD from XML
+For any XML document, should you need to bind a grammar or schema with the file, you can do by either using an existing grammar file, or by generating one using the built-in schema generator.
 
-Using an XML file, an XML Schema/XSD file can be generated from the opening tag in the XML file. With the cursor on the first opening tag, use `Ctrl + .` or `Quick Fix...` and select `Generate foo.xsd and bind with *` to create the file in the the same directory.
+See [Binding with Existing Grammar](../BindingWithGrammar.md#binding-with-existing-grammar) for info on binding to an existing schema.
 
-![GenerateXSDFromXML](../images/Features/GenerateXSDFromXML.gif)
-
-#### Read more
-
-See [Validation with XSD Grammar](../Validation.md#validation-with-xsd-grammar) for more.
-
-### Generate DTD from XML
-
-Using an XML file, a Document Type Definition/DTD file can be generated from the opening tag in the XML file. With the cursor on the first opening tag, use `Ctrl + .` or `Quick Fix...` and select `Generate foo.dtd and bind with *` to create the file in the the same directory.
-
-![GenerateDTDFromXML](../images/Features/GenerateDTDFromXML.gif)
-
-#### Read more
-
-See [Validation with DTD Grammar](../Validation.md#validation-with-dtd-grammar) for more.
+See [Binding with New Grammar](../BindingWithGrammar.md#binding-with-new-grammar) for info on grammar generation.
 
 ## Selection Range
 

docs/README.md

@@ -12,6 +12,7 @@ Welcome to the [vscode-xml](https://github.com/redhat-developer/vscode-xml) docu
   * [Troubleshooting](Troubleshooting.md#troubleshooting): Info on troubleshooting and fixes to issues.
   * [Features](Features.md#features): Notable info and demos on features available to use.
   * [Proxy](Proxy.md#proxy): Instructions for setting up vscode-xml to work behind a proxy.
+  * [Binding With Grammar](BindingWithGrammar.md#binding-with-grammar): Extension feature to bind an XML document to a grammar/schema file.
 
 ## Developer Guide