Adds a new style into the logical style hierarchy.

  Adds a new style into the logical style hierarchy. Style attributes
resolve from bottom up so an attribute specified in a child
will override an attribute specified in the parent.
Returns: the style
Parameters:
- nm - the name of the style (must be unique within the collection of named styles). The name may be null if the style is unnamed, but the caller is responsible for managing the reference returned as an unnamed style can't be fetched by name. An unnamed style may be useful for things like character attribute overrides such as found in a style run.
- parent - the parent style. This may be null if unspecified attributes need not be resolved in some other style.

  Takes a set of attributes and turn it into a background color specification.

  Takes a set of attributes and turn it into a background color
specification. This might be used to specify things
like brighter, more hue, etc.
Returns: the color
Parameters:
- attr - the set of attributes

  Gets the element that represents the character that is at the given offset within the document.

  Gets the element that represents the character that
is at the given offset within the document.
Returns: the element
Parameters:
- pos - the offset >= 0

  Takes a set of attributes and turn it into a font specification.

  Takes a set of attributes and turn it into a font
specification. This can be used to turn things like
family, style, size, etc into a font that is available
on the system the document is currently being used on.
Returns: the font
Parameters:
- attr - the set of attributes

  Takes a set of attributes and turn it into a foreground color specification.

  Takes a set of attributes and turn it into a foreground color
specification. This might be used to specify things
like brighter, more hue, etc.
Returns: the color
Parameters:
- attr - the set of attributes

  Gets a logical style for a given position in a paragraph.

  Gets a logical style for a given position in a paragraph.
Returns: the style
Parameters:
- p - the position >= 0

  Gets the element that represents the paragraph that encloses the given offset within the document.

  Gets the element that represents the paragraph that
encloses the given offset within the document.
Returns: the element
Parameters:
- pos - the offset >= 0

  Fetches a named style previously added.

  Fetches a named style previously added.
Returns: the style
Parameters:
- nm - the name of the style

  Removes a named style previously added to the document.

  Removes a named style previously added to the document.
Parameters:
- nm - the name of the style to remove

  Changes the content element attributes used for the given range of existing content in the document.

  Changes the content element attributes used for the given range of
existing content in the document. All of the attributes
defined in the given Attributes argument are applied to the
given range. This method can be used to completely remove
all content level attributes for the given range by
giving an Attributes argument that has no attributes defined
and setting replace to true.
Parameters:
- offset - the start of the change >= 0
- length - the length of the change >= 0
- s - the non-null attributes to change to. Any attributes defined will be applied to the text for the given range.
- replace - indicates whether or not the previous attributes should be cleared before the new attributes as set. If true, the operation will replace the previous attributes entirely. If false, the new attributes will be merged with the previous attributes.

  Sets the logical style to use for the paragraph at the given position.

  Sets the logical style to use for the paragraph at the
given position. If attributes aren't explicitly set
for character and paragraph attributes they will resolve
through the logical style assigned to the paragraph, which
in turn may resolve through some hierarchy completely
independent of the element hierarchy in the document.
Parameters:
- pos - the starting position >= 0
- s - the style to set

  Sets paragraph attributes.

  Sets paragraph attributes.
Parameters:
- offset - the start of the change >= 0
- length - the length of the change >= 0
- s - the non-null attributes to change to. Any attributes defined will be applied to the text for the given range.
- replace - indicates whether or not the previous attributes should be cleared before the new attributes are set. If true, the operation will replace the previous attributes entirely. If false, the new attributes will be merged with the previous attributes.